Reincarnation Ending Explained: Professor Omori’s Experiment, Nagisa’s True Identity and the Final Smile (Spoilers)

Spoiler Warning: This article contains major spoilers for Reincarnation, including the complete story, Professor Omori’s experiment, the identities of the reincarnated victims and the film’s ambiguous ending.

Takashi Shimizu’s Reincarnation is the kind of horror movie that becomes more disturbing once its mystery starts making sense.

At first, the film appears to be about ghosts connected to an old hotel massacre. Strange figures appear in mirrors, people see impossible reflections, and a mysterious little girl carrying a doll keeps appearing around aspiring actress Nagisa Sugiura.

But the deeper truth is far more complicated.

The spirits are connected to a mass murder committed decades earlier, and many of the people living in the present are actually reincarnations of those who died.

The biggest twist is that Nagisa is not the reincarnation of the little girl she believes herself to be.

She is connected to the killer himself.

Here is the complete story and ending of Reincarnation explained.

The Strange Events Before the Movie Begins

The film immediately establishes that something supernatural is happening across Tokyo.

A group of schoolgirls are sitting inside a café when one girl suddenly feels as though somebody has touched her hair. When she looks at a phone with a dark screen, she sees the reflection of a terrifying man's face behind her.

She turns around.

Nobody is there.

Elsewhere, a businessman sitting alone in a park sees a mysterious man nearby. The figure disappears, only to appear again behind him inside an elevator.

After this encounter, the businessman seems strangely empty, almost as if something inside him has changed.

A truck driver experiences something similar.

While looking into a bathroom mirror, his face appears to change for a moment. Later, while driving along an empty road, he apparently hits a man.

When he checks underneath the truck, he sees the same person whose face appeared in the mirror.

Even more disturbing, several shadowy figures appear to be watching him from the darkness.

These early scenes reveal that the supernatural events are not limited to a single person. Different individuals are being pulled toward something connected to their forgotten pasts.

Director Matsumura Plans a Film About an Old Massacre

The story then introduces movie director Matsumura.

He is preparing a film called Memories, based on a real mass murder that happened around 35 years earlier.

According to the story, university professor Norihisa Omori murdered 11 people inside a hotel, including members of his own family, hotel employees and guests.

One important object keeps appearing around Matsumura: an orange ball.

The ball is eventually connected to a particular room in the hotel, Room 227, where an old doll has remained hidden inside a dusty closet.

The doll suddenly appears to come alive.

Its message is chilling:

“We will always be together.”

That sentence becomes one of the most important clues to understanding the ending.

Nagisa Sugiura Gets the Role of Chisato

During auditions for Memories, another actress named Yuka Morita claims that she remembers a previous life.

Yuka believes she was murdered by strangulation in that past life, and she points to a birthmark on her neck as evidence.

Then Matsumura notices Nagisa Sugiura.

Nagisa is a young actress, and something about her immediately attracts his attention.

Soon after the audition, Nagisa begins seeing a small girl carrying the same doll connected to Room 227.

On a subway platform, Nagisa watches the mysterious child apparently fall beside the train tracks.

But nobody else reacts.

The girl is not an ordinary child.

She is a spirit.

Nagisa later receives the script for Memories and learns that she has been chosen to play Chisato Omori, Professor Omori’s six-year-old daughter.

Chisato was the final victim of the massacre.

She is also the same little girl whose spirit Nagisa has been seeing.

Naturally, Nagisa starts wondering whether she might somehow be Chisato reincarnated.

The movie intentionally encourages both Nagisa and the audience to believe this.

But that assumption is wrong.

Nagisa Begins Seeing the Past

Once Nagisa reads the script, her connection with the massacre becomes much stronger.

She experiences visions of the hotel and sees the spirits of people connected to the murders.

Later, the cast is shown a detailed model of the hotel so that the production can recreate it accurately.

While looking at the model, Nagisa suddenly finds herself standing outside the real hotel.

Near the entrance is Chisato’s doll.

Another young woman, Yayoi Kinoshita, also begins experiencing visions of the same location.

Yayoi is a college student who has dreamed about the mysterious hotel since childhood despite never visiting it.

Her professor discusses reincarnation and cryptomnesia—the idea that people can sometimes experience memories without understanding their true source.

The scientific explanation attempts to dismiss reincarnation.

However, Yayoi’s dreams are far too specific to be easily explained.

The Cast Visits the Real Hotel

Nagisa becomes increasingly frightened during filming.

At one point she sees Professor Omori’s spirit on the set and collapses.

She considers leaving the movie, but her agent Murakawa convinces her that the role could become a major career opportunity.

Eventually, Matsumura takes the cast and crew to the actual hotel where the massacre took place.

Inside, the atmosphere changes.

The actors lie in the exact locations where the original victims were found so photographs can be taken for reference.

But Nagisa begins seeing the actors as the real murder victims.

She enters a bathroom to calm herself.

When she comes back out, she appears to have travelled into the hotel’s past.

There is blood on the floor.

She follows the trail upstairs and sees an injured boy.

The boy is Yuya Omori, Professor Omori’s son.

His orange ball falls and begins bouncing away.

Nagisa then witnesses Professor Omori carrying a camera and a knife.

Omori is recording the murders.

He catches his injured son Yuya and kills him.

Terrified, Nagisa runs to Room 227 and hides inside the closet.

Professor Omori approaches.

But when the closet opens, Matsumura is standing there instead.

Nagisa has returned to the present.

Matsumura then tells her that Room 227 was where Chisato was murdered.

Yuka’s Birthmark Reveals Another Reincarnation

Meanwhile, Yayoi continues investigating her recurring dreams.

Yuka shows her an old newspaper photograph of a hotel maid murdered by Professor Omori.

Yuka believes she was that maid in her previous life.

The maid was killed by hanging.

That explains why Yuka has a birthmark around her neck.

Later, supernatural figures attack Yuka inside a library and take her away.

Yayoi discovers that Professor Omori’s wife, Ayumi Omori, was the only survivor of the original massacre.

Desperate for answers, Yayoi eventually visits her.

Professor Omori’s Reincarnation Experiment Explained

Ayumi shows Yayoi Professor Omori’s old research.

This reveals the real reason behind the massacre.

Omori was obsessed with a question:

What happens to human consciousness after death?

He believed that the human body was merely a vessel.

According to his theory, the body could die while the soul continued to exist independently and eventually entered another body.

But Omori did not simply want to discuss reincarnation.

He wanted to prove it.

His horrifying experiment involved murdering people to see whether their souls would later return in new bodies, possibly carrying memories, trauma or physical signs from their previous deaths.

That is why he murdered 11 people and eventually killed himself.

Decades later, the movie suggests that his experiment actually worked.

But not in the peaceful way Omori may have imagined.

The Victims Return 35 Years Later

The souls of the murder victims are reborn.

However, they remain spiritually connected to the violence of their previous deaths.

Yuka is the reincarnation of the murdered maid.

The truck driver is connected to the hotel desk clerk.

The businessman is connected to another hotel victim.

Other reincarnated victims are also gradually drawn back toward the hotel.

Their souls have not escaped the trauma.

They are trapped between their present identities and memories of their previous lives.

Once Matsumura begins making a film about the massacre, all these reincarnated people start being pulled together again.

It is almost as if recreating the murders has restarted the supernatural cycle.

Why Everyone Returns to the Hotel

Yayoi eventually drives to the hotel to discover the truth about her childhood dreams.

Inside, she finds the doll.

Then the reincarnated victims begin appearing.

The businessman is there.

The truck driver is there.

Yuka is there.

One by one, they return to the positions connected to their previous deaths.

The hotel itself seems to transform back into its appearance from 35 years earlier.

Then the deaths begin repeating.

Yuka appears in the same hanging position as the maid.

Others experience versions of the deaths they suffered in their previous lives.

Past and present have merged.

The massacre is happening again.

Matsumura’s True Identity

At the same time, Murakawa watches the old film recorded by Professor Omori during the murders.

Every death on Omori’s footage appears to correspond with what is happening to the reincarnated victims in the present.

Then another major truth is revealed.

Director Matsumura is the reincarnation of Yuya Omori.

Professor Omori’s young son.

This explains the repeated appearance of the orange ball around Matsumura.

The ball originally belonged to Yuya.

When the old footage reaches Yuya’s death, Matsumura dies in the present as well.

His past-life death has repeated itself.

Is Yayoi the Reincarnation of Chisato?

Yes.

This is one of the movie’s biggest twists.

Nagisa spends much of the story believing that her connection with Chisato means she must be Chisato reincarnated.

But when Nagisa reaches Room 227 and opens the closet, she finds Yayoi.

The truth becomes clear:

Yayoi is Chisato Omori reincarnated.

Her childhood dreams about the hotel were memories from Chisato’s previous life.

This also explains why Ayumi is shocked when Yayoi shows her childhood drawings.

Chisato used to make similar drawings.

But if Yayoi is Chisato, who is Nagisa?

That leads to the film’s most disturbing reveal.

Who Is Nagisa Really?

Nagisa is the reincarnation of Professor Norihisa Omori.

The killer.

Throughout the movie, Nagisa believes she is being haunted because she is connected to one of Omori’s victims.

In reality, the victims are being drawn toward her because the soul inside Nagisa belongs to the person who murdered them.

Once this truth is revealed, the spirits begin surrounding Nagisa.

From their perspective, Professor Omori has returned.

His body may look completely different, but his soul survives inside Nagisa.

The victims finally have the opportunity to confront their killer again.

Why Nagisa Repeats Omori’s Final Moments

Nagisa runs from the spirits and eventually hides in an attic.

She finds a piece of broken glass.

When she looks at her reflection, she does not see herself.

She sees Professor Omori.

At exactly the same time, Murakawa is watching the old recording.

When Omori looks into the reflection of his knife in the past, Nagisa appears in it.

The two timelines have completely connected.

Professor Omori killed himself after completing the massacre.

Now Nagisa begins raising the broken glass toward her own throat.

She is about to repeat Omori’s death.

If that happens, Omori’s soul could potentially die again and continue the reincarnation cycle.

But Chisato stops it.

The doll suddenly appears restored and moves toward Nagisa.

Once again, the message is heard:

“We will always be together.”

Nagisa survives.

And that may actually be a punishment worse than death.

Why Chisato Saves Nagisa

Chisato is not necessarily saving Nagisa out of kindness.

Remember what Nagisa really represents.

She carries Omori’s soul.

If Nagisa dies in the same way Omori died, his soul could potentially escape this body and reincarnate again.

Chisato appears to prevent that.

Instead of allowing her father to die and begin another life, she keeps him trapped inside Nagisa.

Omori spent his life obsessed with proving that souls could escape physical death.

Now his own theory becomes his punishment.

He survives.

But he cannot escape.

What Happens to Nagisa After the Hotel?

The movie production collapses.

Matsumura disappears, and the other people connected to the hotel do not return.

Nagisa is apparently the only one left.

Footage of her breakdown is later shown inside a screening room.

Ayumi Omori watches it.

When she sees Nagisa suffering, she appears strangely satisfied.

Ayumi may understand exactly who Nagisa really is.

Her husband murdered her children and destroyed her family.

Now the soul of that same man appears to be trapped inside a terrified young woman being psychologically tormented by the spirits of his victims.

For Ayumi, it may feel like justice.

Reincarnation Ending Explained

The final scene takes place in a mental hospital.

Nagisa is restrained in a straitjacket.

Ayumi approaches the room and slides two objects underneath the door.

Chisato’s doll.

And Yuya’s orange ball.

Soon, the spirits of Chisato and Yuya appear.

They repeat the familiar message:

“We will always be together.”

Nagisa initially reacts with terror.

But then something unexpected happens.

She smiles.

That smile is the final mystery of Reincarnation.

What Does Nagisa’s Final Smile Mean?

The movie deliberately leaves the smile open to interpretation.

One possibility is that the smile belongs psychologically to Omori.

His experiment succeeded.

He believed the soul survived death, and Nagisa’s existence proves that his own soul has survived inside another body.

The victims also reincarnated.

If the smile represents Omori, he may be experiencing satisfaction because his horrific theory has finally been proven correct.

But there is another, darker interpretation.

The smile may represent acceptance of punishment.

Chisato repeatedly says that they will always be together.

At first, the sentence sounds threatening.

By the ending, its meaning changes.

Professor Omori murdered his own children while trying to prove that souls could live beyond death.

Now those children have returned.

And they may remain attached to him forever.

Omori wanted immortality.

He got it.

But immortality means spending eternity with the souls of the children he murdered.

Did Professor Omori Win or Lose?

Technically, Omori proved his theory.

The human body really does appear to be a vessel in the supernatural logic of the movie.

The victims died and were reborn.

Their past experiences survived.

Some even carried physical or psychological traces of their previous deaths.

Omori himself was reincarnated as Nagisa.

So scientifically, within his own twisted experiment, he succeeded.

Morally and spiritually, however, his experiment completely backfired.

The violently murdered souls never found peace.

They returned carrying trauma.

Eventually, they were drawn back toward their killer.

And instead of allowing Omori to simply die again, Chisato appears to prevent his escape.

His greatest discovery becomes his prison.

Was Everything Only Happening Inside Nagisa’s Mind?

The film also leaves room for a more psychological interpretation.

Nagisa becomes deeply immersed in the role of Chisato while making a movie about an extremely disturbing murder case.

By the end, she experiences a complete breakdown.

This allows viewers to question whether some of the ghosts, visions and supernatural events could represent Nagisa losing the ability to separate her identity from the story she is performing.

However, the experiences of Yayoi, Yuka and other characters make a purely psychological explanation difficult.

The film repeatedly shows different people independently experiencing connections to the massacre.

That strongly supports the supernatural interpretation.

Still, the movie never completely removes ambiguity.

Was Ayumi Omori Secretly Controlling Everything?

Another interpretation focuses on Ayumi.

She survived the massacre.

She knew about her husband’s reincarnation research.

She also recognized the connections between the present and her murdered children.

Her reaction to Nagisa suggests that she may understand far more than she admits.

It is possible that Ayumi allowed events surrounding the film production to continue because she knew that bringing everyone connected to the massacre together might finally trap Omori.

Her decision to place Chisato’s doll and Yuya’s ball inside Nagisa’s hospital room feels especially deliberate.

Whether she planned everything or simply recognized the opportunity is never fully explained.

The Real Meaning of “We Will Always Be Together”

The sentence spoken by Chisato is the key to the ending.

At the beginning, it sounds like a creepy phrase connected to a haunted doll.

By the end, it becomes something much more personal.

Professor Omori believed souls would continue moving from one body to another.

He murdered his children while pursuing that belief.

But Chisato appears to change the rules.

Instead of letting Omori continue moving freely through the reincarnation cycle, she binds herself and Yuya to him.

They really will always be together.

For the children, it may mean never losing their father again.

For Omori, it is eternal punishment.

Final Thoughts

Reincarnation is ultimately less about whether reincarnation exists and more about the consequences of trying to control it.

Professor Omori murders 11 people because he believes death can prove that the soul is immortal.

His theory turns out to be horrifyingly close to the truth.

The souls return.

The memories return.

The trauma returns.

And eventually the murderer returns too.

Nagisa is Professor Omori reincarnated, Yayoi is Chisato reincarnated, Matsumura is Yuya reincarnated, and several other characters are reborn versions of the hotel massacre victims.

When the old massacre begins repeating itself, Chisato finally interrupts the cycle by preventing Nagisa from repeating Omori’s suicide.

Instead of death, Omori receives something worse.

He remains trapped.

The final appearance of Chisato’s doll and Yuya’s orange ball suggests that the children are still connected to him.

Whether Nagisa’s final smile represents Omori’s satisfaction, psychological collapse or acceptance of his supernatural imprisonment is intentionally left unresolved.

That uncertainty is what makes the final scene so effective.

Professor Omori wanted proof that death was not the end.

He got his answer.

Unfortunately for him, surviving death may have been the worst thing that could have happened.