Two men spent 25 years loving women who never chose them. One became a murderer. The other was given a second chance. What made them different?
The finale of the Japanese mystery drama 25 Years of You (Kokuhaku: 25-nenme no Himitsu) reveals that the greatest mystery was never simply the identity of the killer.
It was the meaning of love itself.
For most of the series, Sota Yukimura appears to be a deeply devoted man who has spent a quarter of a century protecting Mariko Nose.
He attended the same schools, followed a similar path, and eventually worked at the same company.
He knows an extraordinary amount about her life.
But as the story unfolds, that devotion begins to look increasingly disturbing.
Is Yukimura a romantic hero?
Or is he someone who has spent 25 years refusing to let go of a woman who never agreed to be the center of his existence?
Then the final episode reveals the truth about Taisuke Sakura.
Taisuke killed Mariko’s biological mother, Kyoko, after she rejected him 25 years earlier. His obsession eventually extends to Mariko, who resembles the woman he murdered.
Suddenly, the drama presents two men whose emotional histories seem uncomfortably similar.
Both have built their lives around women they claim to love.
Both have confused their own feelings with a special connection.
And both have spent decades unable to move forward.
Yet the finale draws a decisive distinction between them.
The difference is not how intensely they loved. It is what they did when the women they loved had the right to say no.
That distinction changes the meaning of the entire series.
Spoiler warning: This article discusses the full ending of 25 Years of You, including the identity of the killer and the final reunion.
The Short Answer: Was Yukimura’s Love Actually Obsession?
Yes, elements of Yukimura’s behavior are obsessive.
He spends 25 years watching over Mariko, arranging his life around her, and making decisions based on what he believes will protect her.
His behavior crosses personal boundaries, even when his intentions are protective.
But the ending does not present him as morally equivalent to Taisuke.
Taisuke responds to rejection with violence. He kills Kyoko and later develops a dangerous fixation on her daughter.
Yukimura, by contrast, eventually acknowledges that his actions were wrong.
He leaves Mariko’s life, builds an existence independent of her, and accepts that she may never return his feelings.
When they meet again a year later, he finally confesses his love without demanding an answer.
Mariko does not tell him that he has always been her destined partner.
Instead, she suggests that they could become something meaningful in the future.
Yukimura’s redemption begins when he stops treating his 25 years of devotion as a reason Mariko should love him back.
That is the key to the ending.
Why Did Yukimura Follow Mariko for 25 Years?
Yukimura’s attachment to Mariko began when they were young.
Over the following decades, he repeatedly positioned himself close to her.
Their paths crossed through school, university, and eventually Nose Cosmetics.
From Yukimura’s perspective, these choices were expressions of devotion.
He wanted to remain near the person he loved.
He wanted to protect her happiness.
He believed that knowing her life intimately would allow him to anticipate danger and help her when necessary.
But there is an uncomfortable question beneath that apparently romantic motivation.
Did Mariko ever ask him to organize his entire life around hers?
The answer matters because affection does not automatically authorize involvement.
A person can sincerely want someone else’s happiness while still interfering with that person’s freedom.
Yukimura’s problem is not simply that he loves Mariko for a long time.
It is that he begins treating his private understanding of her happiness as a substitute for her own choices.
The Danger of Loving Someone Without Really Knowing Them
Yukimura knows many details about Mariko.
But knowledge and intimacy are not identical.
Knowing someone’s routine does not mean understanding their wishes.
Predicting someone’s behavior does not mean sharing a relationship with them.
And watching someone from a distance does not give that person an opportunity to know you in return.
For 25 years, Yukimura’s feelings largely exist inside his own imagination.
He has created a story in which he is Mariko’s protector.
But Mariko has not been allowed to participate equally in writing that story.
This is why the series’ central romantic premise is so unsettling.
Yukimura has spent 25 years loving Mariko, but he has not spent 25 years building a mutual relationship with her.
The distinction becomes essential in the finale.
What Did Taisuke Do to Kyoko 25 Years Ago?
The final episode reveals that Taisuke Sakura was responsible for the death of Kyoko, Mariko’s biological mother.
Twenty-five years earlier, the young Taisuke had developed feelings for Kyoko.
When she rejected him, he reacted violently.
He pushed her from a bridge, killing her.
For years, the truth remained hidden.
Kyoko’s death was misunderstood by people around her, and the circumstances were concealed rather than properly exposed.
The finale also reveals Taisuke’s responsibility for the later murders of Tateiwa and Sayuri.
His crimes are ultimately uncovered, and he is arrested.
This revelation transforms Taisuke from a suspicious figure in the mystery into the embodiment of its darkest theme.
He did not merely fail to move on from a rejected romance.
He turned rejection into justification for violence.
Why Taisuke’s Motive Matters More Than His Identity
In a conventional murder mystery, identifying the killer is the ultimate reward.
But 25 Years of You makes the motive more important than the name.
Taisuke’s crime begins with a refusal to accept another person’s decision.
Kyoko did not want the relationship he imagined.
Rather than recognizing her autonomy, he reacted as though her rejection was an intolerable wrong.
That is the moment when his feelings become something profoundly destructive.
Taisuke does not kill because he loves too much. He kills because he believes his desire matters more than Kyoko’s freedom.
Calling that behavior love would obscure the moral reality of the crime.
His fixation is possessive, and his response to rejection is violent.
The series places that history alongside Yukimura’s devotion so viewers will ask whether romantic persistence can become dangerous when it stops respecting boundaries.
Why Did Taisuke Become Obsessed With Mariko?
The final episode reveals another disturbing aspect of Taisuke’s fixation.
Mariko resembles her biological mother, Kyoko.
Taisuke’s unresolved attachment to Kyoko becomes entangled with his feelings toward Mariko.
This is not simply a new romance.
It is a repetition of an old obsession.
Mariko becomes connected to the woman Taisuke lost through his own violence.
His fixation suggests that he has never truly confronted what he did.
Instead of accepting Kyoko’s death and his responsibility for it, he continues to project his desires onto another person.
That makes his attachment to Mariko especially threatening.
He is not seeing her as an independent individual with her own history and choices.
He is seeing her through the memory of someone else.
The Difference Between Remembering Someone and Replacing Them
Grief and regret can shape a person’s life for decades.
But Taisuke’s behavior goes beyond memory.
He treats Mariko’s resemblance to Kyoko as emotionally significant in a way that threatens Mariko’s individuality.
The woman he once wanted rejected him.
Now her daughter becomes the focus of his distorted emotional world.
This is why his obsession cannot be understood as merely a tragic inability to forget.
He is not preserving Kyoko’s memory. He is attempting to preserve his claim over a relationship that never belonged to him.
That makes him a frightening reflection of the drama’s central romantic theme.
Yukimura and Taisuke: The Similarities the Drama Wants Us to Notice
At first, the two men appear fundamentally different.
Yukimura is the devoted protector.
Taisuke is the hidden killer.
But their stories share several disturbing elements.
Both remain emotionally attached to a woman over an extraordinary period.
Both build important parts of their lives around that attachment.
Both believe they understand the person they love.
And both struggle to distinguish their own desires from the other person’s wishes.
The comparison is not meant to suggest that every obsessive admirer will become violent.
Nor does it make Yukimura responsible for crimes he did not commit.
Instead, it reveals a shared starting point that leads to radically different outcomes.
| Question | Sota Yukimura | Taisuke Sakura |
|---|---|---|
| How long does his fixation last? | 25 years | 25 years |
| Does he fully respect boundaries at first? | No | No |
| Does he make another person central to his identity? | Yes | Yes |
| How does he respond to the truth about his behavior? | Acknowledges wrongdoing | His crimes are exposed |
| Does he accept the possibility of not being chosen? | Ultimately, yes | His rejection of that possibility leads to violence |
| What happens in the ending? | Begins an independent life and reconnects with Mariko | Is arrested for his crimes |
The most important row is not the length of their attachment.
It is their response to another person’s freedom.
The series does not divide the men into one who loves intensely and one who loves weakly. It divides them according to whether they can accept that love does not create ownership.
The Real Turning Point: Yukimura Leaves Mariko
After the truth is revealed, Yukimura resigns from Nose Cosmetics.
He also leaves Mariko’s immediate world.
For someone who has spent 25 years arranging his life around her, this is an extraordinary decision.
It may be the most important action he takes in the entire drama.
Not because leaving is automatically noble.
And not because disappearing is always the best way to repair a relationship.
But because Yukimura finally stops making his own presence in Mariko’s life seem inevitable.
He allows her to exist without his constant involvement.
At the same time, he begins to discover who he is without her.
Why His Departure Matters More Than His Confession
Romantic stories often treat a confession as the decisive proof of love.
A character finally says what they have felt for years.
The other person recognizes the depth of that devotion.
The relationship begins.
But Yukimura’s confession would have meant very little if he had continued behaving exactly as before.
He needed to change the relationship between his feelings and his actions.
Leaving Nose Cosmetics is part of that change.
It means giving up the daily structure that kept him close to Mariko.
It means losing the convenient circumstances through which he could continue watching over her.
Most importantly, it means accepting that his future cannot remain entirely dependent on hers.
Yukimura’s growth is not demonstrated by how long he has loved Mariko. It is demonstrated by his willingness to live without her.
That is what makes the final reunion meaningful.
What Happened During the One-Year Time Jump?
The finale moves forward one year.
Yukimura is now living in a port town, away from his former workplace and routine.
His life is simpler.
He interacts with people who know him independently of Mariko.
He begins accumulating experiences that are not defined by his long-standing romantic fixation.
This is a subtle but important change.
For much of the series, Yukimura’s identity is inseparable from his feelings for Mariko.
He is the man who has loved her for 25 years.
He is the man who protects her.
He is the man who knows her history.
In the port town, he is allowed to become something else.
He is simply Sota Yukimura.
Why the Time Jump Is Necessary
Without the year apart, the ending would be much harder to defend.
If Yukimura confessed immediately after the revelations and Mariko accepted him, the story might appear to reward his invasive behavior.
It would suggest that 25 years of surveillance had finally paid off.
But the separation interrupts that logic.
Yukimura has to build a life that does not depend on being chosen by Mariko.
Mariko also gains distance from the secrets and manipulation surrounding her.
When they meet again, their relationship no longer has to continue exactly where it left off.
The year apart creates the possibility that they can meet as two independent adults rather than as a watcher and the person he watches.
That does not erase the past.
But it changes the conditions under which a future relationship might begin.
What Does Mariko Mean by “Not Yet” in the Final Scene?
The final reunion is one of the drama’s most important scenes.
Yukimura and Mariko encounter each other in the port town.
He finally tells her directly that he has loved her for 25 years.
But Mariko does not simply respond by declaring that he was her destined partner all along.
She tells him that he is not her person of destiny.
Then she adds the crucial qualification:
Not yet.
That small addition transforms the scene.
She is not saying that his devotion has earned her love.
She is saying that their relationship could become meaningful through what they choose to build from this point forward.
Destiny Is No Longer Something Yukimura Can Decide Alone
Throughout the series, Yukimura behaves as though his connection with Mariko has already been established.
His decades of devotion make the relationship feel inevitable to him.
But inevitability exists only in his mind.
Mariko has not shared the same experience.
She has not spent those 25 years participating in a mutual romance.
Her final answer rejects the idea that his past feelings automatically determine their future.
She does not deny that a relationship might develop.
She simply refuses to treat it as already completed.
Twenty-five years of loving someone do not make you their destined partner. What matters is whether the two of you choose each other now.
That is the meaning of her answer.
Did Mariko Really Forgive Yukimura?
The ending suggests that Mariko is willing to move forward with him.
But it is important not to confuse that willingness with a complete moral absolution.
Yukimura’s actions crossed boundaries.
His long-standing surveillance and interference cannot be made harmless simply because he ultimately helps uncover the truth.
Nor should Mariko’s possible romantic interest be interpreted as proof that his behavior was acceptable all along.
The finale works best when read as a story about accountability and change.
Yukimura recognizes that his actions were wrong.
He steps away.
He begins living independently.
And he approaches Mariko again without claiming that she owes him a relationship.
Mariko is then free to decide whether she wants to know this changed version of him.
That is a different dynamic from the one that existed before.
Why Redemption Is Not the Same as Reward
A troubling interpretation of the finale would be that Yukimura receives Mariko as a reward for 25 years of persistence.
That would undermine the drama’s criticism of obsession.
A stronger interpretation is that he becomes capable of a healthy relationship only after abandoning the idea that persistence should be rewarded.
Mariko’s choice remains hers.
She can accept him, reject him, or take time to decide.
The story’s hopeful ending depends on that freedom.
Yukimura does not become worthy of love because he waited long enough. He becomes capable of mutual love when he learns that waiting creates no entitlement.
Why Some Reddit Viewers Still Call Yukimura a Stalker
The final episode prompted an interesting discussion among viewers on Reddit.
One commenter described Yukimura as a good person despite his stalking tendencies.
Another drew a distinction between Yukimura and Taisuke, treating Taisuke as the more clearly dangerous obsessive figure.
The discussion captures a genuine tension in the drama.
Yukimura’s actions can be disturbing even if his intentions are sympathetic.
And Taisuke’s violence does not make Yukimura’s boundary violations disappear.
It is possible to recognize a meaningful moral difference between the two men without declaring Yukimura’s behavior harmless.
Does the Drama Romanticize Stalking?
There is a reasonable argument that it does.
Yukimura is attractive, loyal and emotionally sincere.
The narrative places him in the role of protector.
The final reunion is presented warmly.
Those choices may encourage viewers to reinterpret years of intrusive behavior as evidence of extraordinary devotion.
That is a risk the drama takes.
But the ending also includes a corrective.
Yukimura does not win Mariko simply by continuing his previous behavior.
He has to recognize his mistakes and step away.
Whether that is enough to overcome the romantic framing is a matter of interpretation.
The drama is most convincing when it asks viewers to recognize Yukimura’s wrongdoing rather than excuse it because Taisuke is worse.
That distinction prevents the story from becoming a simple celebration of obsessive persistence.
Was Taisuke Always the Villain, or Did the Final Twist Come Too Late?
The finale also raises a separate storytelling question.
Was Taisuke’s identity as the killer adequately prepared by the earlier episodes?
Some viewers praised the final revelations but felt the series could have used stronger foreshadowing.
That criticism matters because a mystery ending must do more than surprise the audience.
Ideally, it should also change the meaning of earlier scenes.
When the killer is revealed, viewers should be able to reconsider what they have already seen.
Taisuke’s long-standing attachment to Kyoko and his later fixation on Mariko provide a thematic explanation for his crimes.
But thematic consistency and satisfying detective-story construction are not the same thing.
A twist can fit the drama’s central message while still feeling insufficiently signaled.
Why the Final Twist Works Better as a Moral Revelation
The strongest aspect of Taisuke’s reveal is not the mechanics of the investigation.
It is the contrast with Yukimura.
Once Taisuke’s motive becomes clear, the audience can reinterpret Yukimura’s story.
Both men have spent decades imagining themselves connected to a woman.
But one responds to rejection by destroying another person’s life.
The other eventually accepts that he must change.
The twist therefore resolves two mysteries at once.
Who killed Kyoko?
And what separates love from obsession?
The killer reveal is most effective not as a shocking name, but as the answer to the drama’s moral question.
Why Kyoko’s Death Matters to Mariko’s Ending
Mariko’s entire life has been shaped by a secret she did not create.
Her mother’s death was concealed behind an incorrect understanding of what happened.
Family members carried their own assumptions and secrets.
And Taisuke’s actions continued to affect people decades later.
The revelation of the truth gives Mariko something she has been denied for years.
A more accurate understanding of her own history.
That matters for her relationship with Yukimura.
Throughout the series, other people have repeatedly acted on what they believed was best for her.
They have concealed information.
They have tried to protect her.
They have decided which truths she should know.
Even Yukimura’s devotion has involved making choices around her without fully including her.
By the finale, Mariko must reclaim the right to interpret her own life.
Her response to Yukimura is part of that process.
She does not simply accept the destiny he has imagined.
She offers a future on terms she can choose.
The ending is not only about Yukimura learning to let go. It is about Mariko finally being allowed to decide what her own story means.
The Meaning of “My 25-Year Love Is Over”
One of the finale’s most revealing ideas is that Yukimura’s 25-year love has ended.
At first, that sounds like a tragic conclusion.
Has he finally given up?
Has Mariko rejected him?
Will his devotion remain unfulfilled?
But the final episode suggests another interpretation.
The love that has ended is the one-sided relationship Yukimura maintained inside his own imagination.
For 25 years, he loved Mariko without creating an equal partnership.
His feelings shaped his life, but they did not create a shared romance.
When he steps away, that version of love ends.
And when he meets Mariko again, something different becomes possible.
Not the continuation of an old fantasy.
The beginning of a relationship in which both people can participate.
Why an Ending Can Also Be a Beginning
Unrequited love does not end only when someone is rejected.
It can also end when the relationship changes into something mutual.
But that transformation requires more than a confession.
It requires both people to meet each other honestly.
Yukimura must stop treating his history as destiny.
Mariko must be free to decide whether she wants a future with him.
Only then can the relationship move beyond his private devotion.
The 25-year love story ends because a new story finally has room to begin.
That is the emotional logic of the final scene.
Frequently Asked Questions
Who killed Kyoko in 25 Years of You?
Taisuke Sakura killed Kyoko 25 years earlier after she rejected him. He pushed her from a bridge.
Was Yukimura the villain?
Yukimura was not the killer, but his behavior toward Mariko crossed boundaries. The ending distinguishes his capacity to recognize wrongdoing and accept Mariko’s freedom from Taisuke’s violent possessiveness.
Why did Taisuke become obsessed with Mariko?
Mariko resembles her biological mother, Kyoko, whom Taisuke had loved obsessively and killed. His unresolved fixation becomes dangerously connected to Mariko.
Did Taisuke kill anyone else?
Yes. The finale also exposes his responsibility for the murders of Tateiwa and Sayuri.
Why did Yukimura leave Nose Cosmetics?
He leaves the company and Mariko’s immediate world after confronting his past actions, allowing himself to begin a life that is not organized entirely around her.
Do Yukimura and Mariko end up together?
The finale suggests a possible romantic beginning rather than confirming a fully established long-term relationship. Mariko indicates that Yukimura could become her destined partner through the future they build together.
What does Mariko mean when she says “not yet”?
She rejects the idea that Yukimura’s 25 years of devotion automatically make him her destined partner. Their relationship must develop through mutual choice.
Is Yukimura’s 25-year love romantic or obsessive?
It contains elements of both sincere affection and unhealthy fixation. The ending emphasizes his growth when he recognizes his mistakes, steps away, and accepts Mariko’s right to choose.
Final Verdict: The Difference Was Never the Length of Their Love
The title 25 Years of You invites us to admire an extraordinary duration of devotion.
Twenty-five years sounds romantic.
It suggests patience, loyalty and an emotion powerful enough to survive decades.
But the finale reveals the danger of judging love by its duration alone.
Taisuke spent 25 years trapped by his fixation on Kyoko.
Yukimura spent 25 years organizing his life around Mariko.
Both men believed their feelings gave them a special connection to someone else.
But the ending exposes the fundamental difference between them.
Taisuke could not accept that Kyoko had the right to reject him.
His obsession became violence.
Yukimura eventually recognized that Mariko’s happiness could not be determined by his devotion alone.
He walked away.
He learned to live independently.
And when he finally confessed his feelings, he accepted that the answer might still be no.
That is why Mariko’s final response matters so much.
She does not reward him for the past.
She invites him to consider a future.
Twenty-five years of obsession can never create a right to another person. But one honest moment, freely shared, can create the possibility of love.
The series begins with a man who believes destiny is something he can protect through devotion.
It ends with a woman who reminds him that destiny is something two people must choose together.
And perhaps that is the most meaningful twist of all.
Yukimura’s greatest act of love was not spending 25 years watching over Mariko. It was finally accepting that he might have to live without her.
Only then could their story truly begin.
Sources and Further Reading
- Nippon TV — 25 Years of You, Episode 10 Synopsis
- TVzuki — Final Episode Breakdown and Ending Analysis (Japanese)
- Atoyomi — The Meaning of the Finale and Taisuke’s Motive (Japanese)
- Papo de Dorama — 25 Years of You Ending Explained
- Reddit / r/JDorama — 25 Years of You: The Final Impression
TTK Original — Beyond the Headlines
Editorial note: This article distinguishes the drama’s confirmed plot developments from interpretations of the characters’ psychology and moral choices. The discussion of obsession, boundaries and consent is critical analysis rather than a clinical diagnosis or a statement of the writers’ confirmed intentions.