Why Does Nanahoshi Want to Return to Japan in Mushoku Tensei?

Nanahoshi Wants Her Original Life Back

The central reason Nanahoshi wants to return to Japan is simple: Japan is her home.

Before appearing in the Six-Faced World, Nanahoshi Shizuka was an ordinary Japanese student. She had a family, friends, familiar food, modern technology, and an expected future. None of those things were voluntarily surrendered. She was suddenly pulled into another reality while still physically herself.

The official anime describes her as a person who was transported in her modern form and is desperately trying to return to her original world. Nanahoshi's voice actor, Shion Wakayama, similarly characterized her as someone whose strong desire to go home determines how she evaluates people and opportunities around her. That framing appears in the anime's official introduction of Nanahoshi as a transported person.

This makes her fundamentally different from Rudeus Greyrat.

Rudeus died on Earth and was reborn as an infant. His former life was already over before he entered the new world. Although he retains memories of Japan, he cannot simply go back to being the man he once was. His emotional journey is about treating his reincarnation as a chance to live differently.

Nanahoshi did not die. She was removed from one life and dropped into another.

From her perspective, accepting the Six-Faced World as her permanent home would mean giving up on people who may still be waiting for her in Japan. Her desire to return is not ingratitude toward those who help her. It is a refusal to treat an involuntary disappearance as destiny.

She Was Summoned, Not Reincarnated

The mechanics of Nanahoshi's arrival explain much of her attitude.

Rudeus was reincarnated into a body native to the Six-Faced World. He grows, produces mana, learns its languages naturally, and becomes physically integrated into its systems.

Nanahoshi arrives in her original Japanese body. She does not undergo the same biological adaptation. She possesses no normal capacity to use the world's magic, does not age in the usual way, and later develops a serious condition associated with her prolonged exposure to its mana-rich environment.

These differences constantly remind her that she does not belong there in the same way Rudeus does.

Her body is effectively evidence that she came from somewhere else. Even when she learns the local language and becomes an influential researcher, she remains a foreign element within the world's magical structure.

That is why she approaches her situation like a technical problem. If magic brought her across worlds, then magic may be capable of sending her back. She studies summoning circles, teleportation ruins, magical languages, and the relationship between matter and dimensional movement.

The licensed English light novels, published by Seven Seas under its Airship imprint, remain the primary English-language source for the complete version of this storyline. The publisher's official Mushoku Tensei light novel catalog lists all 26 main volumes.

Nanahoshi Misses People, Not Just Modern Conveniences

Nanahoshi sometimes appears focused on food, baths, hygiene products, technology, or other aspects of modern life. Those details can make her motivation seem materialistic, but her deeper concern is human connection.

She wants to know what happened to the people she left behind. She worries about how much time may be passing in Japan. She also remains concerned about the two boys who were with her before the accident, particularly because their fates are uncertain.

Her fixation on returning is therefore connected to several emotional needs:

She wants to see her family again. She wants proof that her friends survived. She wants to resume a life that was interrupted without consent. She wants to stop being the only person in her surroundings who remembers where she came from.

Japanese food and familiar songs are not merely comforts. They are reminders of her identity.

The anime emphasizes this emotional layer through its presentation of Nanahoshi's frustration and breakdown. For Episode 15 of the second season, the production selected a special ending song performed by her voice actor. In comments published on the official anime website, Wakayama described Nanahoshi as carrying far more pain and frustration than her calm exterior initially reveals.

Why Nanahoshi Avoids Becoming Attached

Nanahoshi's colder behavior is partly a defense mechanism.

If she forms deep relationships in the Six-Faced World, leaving becomes harder. She therefore attempts to keep emotional distance from the people around her. She evaluates cooperation in terms of whether it advances her research and often withdraws from unnecessary social contact.

This can make her look selfish, dismissive, or ungrateful.

However, her detachment serves a coherent purpose. She believes her stay is temporary. Building a permanent life would feel like admitting that she has failed to return home.

There is also a practical fear behind her isolation. Nanahoshi is biologically foreign to the environment and takes precautions regarding illness and exposure. Her inability to use mana reinforces the sense that ordinary assumptions about local bodies may not apply to her.

Over time, her emotional boundaries weaken. She becomes connected to Rudeus, Sylphiette, Ariel, Zanoba, Cliff, Perugius, and others involved in her life and research. Their support does not erase her desire to return, but it complicates the clean separation she originally imagined.

This is one of Nanahoshi's most important developments: she never fully chooses the Six-Faced World, yet she gradually becomes important to people within it.

How Her Return Research Works

Nanahoshi studies summoning magic because summoning already proves that objects and living beings can cross dimensional boundaries.

Her experiments begin on a limited scale. With Rudeus supplying mana, she works on circles designed to summon matter from Earth or transfer matter between worlds. Progress requires understanding several separate problems:

Identifying the Destination

A teleportation circle needs more than raw power. It must define where an object is coming from or going.

Earth is not simply another continent. It exists outside the Six-Faced World's ordinary geography, so conventional teleportation principles are insufficient.

Supplying Enough Mana

Nanahoshi cannot power the circles herself. Rudeus's unusually large mana reserve makes experiments possible, while Perugius and his knowledge provide another layer of technical support.

Sending a Living Person Safely

Moving an object is not the same as transporting a conscious human body. Any successful return system must preserve Nanahoshi rather than destroy, duplicate, or misdirect her.

Overcoming Outside Interference

Later experiments indicate that the obstacle is not merely a flawed diagram or insufficient mana. Something appears to prevent Nanahoshi from completing the journey at that point in history.

The final volume supplies additional context for this obstruction. It connects dimensional summoning to a future crisis, a powerful Blessed Child, and Nanahoshi's friend. However, the novels do not reduce the entire process to an easily repeatable scientific law.

The confirmed fact is that Nanahoshi cannot simply activate a completed circle and leave whenever she wants. Her ability to return is constrained by a larger chain of causality.

Why Her Failed Experiments Affect Her So Deeply

Nanahoshi's research is the organizing purpose of her life.

Every year spent studying magic is a year spent away from home. Every failed experiment raises the possibility that Japan may be unreachable. Because she has tried not to build a replacement life, failure threatens to leave her with nothing.

This explains the severity of her emotional collapse when her work stalls.

She is not merely disappointed that an academic project failed. She is confronting the possibility that she will never see her family again and that all her isolation, discipline, and sacrifice have achieved nothing.

Rudeus and his friends help her recover by approaching the problem collaboratively. Their intervention demonstrates something Nanahoshi has resisted admitting: she has developed relationships in this world, and those relationships can sustain her even when her route home remains uncertain.

The anime has adapted this stage of her struggle, but the light novels continue far beyond it. The anime's official material still describes her defining goal as returning to her original world, while the full consequences of her research belong to later source material.

Her Illness Makes Returning Even More Urgent

Nanahoshi later suffers from a dangerous condition caused by her incompatibility with the world's mana.

Because she does not naturally circulate or expend mana like local humans, exposure accumulates in a harmful way. Her illness is eventually treated, but it proves that she cannot assume she will survive indefinitely in the Six-Faced World.

This changes the return problem from a personal ambition into a matter of survival.

Even after treatment, she remains physically vulnerable. Perugius eventually uses a form of suspended animation to preserve her, allowing her to wake periodically rather than continue aging and accumulating exposure normally.

Her suspended state is not the fulfillment of her goal. It is a strategy for waiting.

Nanahoshi concludes that the conditions required for her return may not exist until much later. By limiting the time she spends awake, she hopes to survive until the relevant person, event, or dimensional opening appears.

Does Nanahoshi Ever Stop Wanting to Return?

No. The main light novel series never shows Nanahoshi abandoning her desire to return to Japan.

She becomes less emotionally isolated and develops real affection for people in the Six-Faced World, but those bonds do not replace her original home. She continues working toward a future return and preserves herself because she believes the opportunity may come after Rudeus's lifetime.

The ending does not depict her successfully arriving in Japan.

It instead establishes why her journey is connected to events beyond the chronological endpoint of Rudeus's life. The final revelations strongly imply that Nanahoshi's role is not finished, but any detailed account of her eventual return would go beyond what the completed main series confirms.

Claims that she definitively returns, marries a particular person, or lives a fully described life in Japan should therefore be treated as speculation unless supported by a future canonical publication.

Confirmed Facts Versus Interpretation

Confirmed by the Story

Nanahoshi was physically transported from Japan rather than reincarnated.

She wants to return to her original world and dedicates her research to that goal.

She misses her old life and remains concerned about the people she left behind.

Her body is incompatible with the Six-Faced World in ways that affect her magic, aging, and health.

Rudeus helps power her summoning experiments.

Her attempt to return is obstructed by forces connected to the larger dimensional summoning mystery.

She enters suspended animation so she can survive until a future opportunity to return becomes possible.

The main light novel series does not show her completing the return journey.

Reasonable Interpretation

Nanahoshi's emotional distance is partly an attempt to avoid creating reasons to stay.

Her focus on Japanese food and technology helps her preserve her identity while stranded.

Her relationship with Rudeus matters because he is both a research partner and the only person who fully understands what Japan represents.

Her eventual friendships make her situation more emotionally complicated, but they do not erase her original goal.

Unconfirmed or Speculative

The exact details of Nanahoshi's eventual life after the main series remain unresolved.

The novels do not confirm every step of how the dimensional barrier will finally be overcome.

Any assertion that she certainly returns to Japan during Rudeus's lifetime is incorrect. The story points toward a much later resolution.