Miu Osawa

Name: Miu Osawa

True name: Miu

Gender: Female

Age: 16

Height: 159 cm

Race: Half-elf

Parentage: Daughter of Garius and a dark elf woman

Alias/cover identity: Akatsuki Osawa’s younger sister

First-person pronoun: "I" in English, originally using a boyish self-reference

Manifested weapon: Holy Scepter

Voice actor: Youko Hikasa

Miu is the daughter of Garius, the Demon King of the other world Alayzard.

Her father had once been human, and Miu was born from his relationship with a dark elf woman, making her a half-elf.

Before his death, Garius entrusted Miu to Akatsuki Osawa in his final words.

While she was asleep, Akatsuki brought her to the human world, where she began living as his younger sister.

She enrolls at the Babel Academy Japan Branch under this false identity.

Although frightened that her true identity as the Demon King's daughter might be exposed, she gradually finds a place for herself.

Miu initially carries complicated feelings about living with Akatsuki, the man who killed her father.

Over time, Akatsuki’s words help clear away her pain and confusion about the past.

She is timid about her secret and often acts nervous when she thinks others may discover who she really is.

At the same time, she is gentle, sincere, and capable of forming deep bonds with the people around her.

Thanks to Akatsuki creating the opportunity, she becomes close friends with Chikage Izumi and Kuzuha Domoto.

These friendships become an important part of her life in the human world.

One of her most notable quirks is that she struggles to call Akatsuki "big brother" at school.

Instead of using his name, she tends to call him "you."

Later in the original novels, she becomes able to call him "big brother" without hesitation.

Their relationship also develops into an extremely intimate adoptive sibling bond, and she is doted on by Akatsuki alongside the other heroines.

Miu has pink hair styled in twin tails.

She is especially known for her very voluptuous figure.

Official merchandise and illustrations strongly emphasize her large bust, often suggested to be around H-cup size.

Her clothing and swimsuits are frequently drawn as barely containing her figure, making her sex appeal one of her most recognizable visual traits.

Because of this, Akatsuki often targets her for teasing, sexual pranks, and harassment.

This aspect is repeatedly emphasized in her portrayal.

At Babel Academy, Miu enters as a student while hiding her real background.

Despite her anxiety, she slowly builds trust and friendship.

During the ranking battle, Akatsuki’s spectacular performance helps elevate the team’s standing.

Because she was teamed with him, Miu rises from B-Class to A-Class.

The arrival of Phil becomes another turning point in her development.

That incident deepens her bond with Akatsuki and pushes her to choose her future for herself.

Eventually, Miu decides to live not as the Demon King's daughter, but as Akatsuki Osawa’s younger sister.

After the Phil incident is resolved, she travels to Alayzard together with Akatsuki and the others.

Miu’s true nature goes far beyond being the Demon King's daughter.

She is in fact a higher-order life-form that contains divine power.

Because of this, she becomes an essential existence for Cocoon’s so-called Y Project.

That makes her a target of forces across the world.

Kyoya Hikami, who exposes Cocoon’s actions from within, ends up using her for his own purposes.

Even so, Akatsuki rescues her, and this becomes one of the deepest emotional turning points in their relationship.

After being saved, Miu opens both her body and heart to him completely.

She makes an eternal vow, declaring, "I belong forever to you, Akatsuki Osawa."

She then forms a soul covenant with Akatsuki.

Later, she becomes a member of Noah, the organization founded by him, and is appointed as the top executive serving as First Vice Commander.

In private, she continues to be pampered by Akatsuki.

At one greeting with Akatsuki and the other members, she accidentally blurts out an outrageous remark and is left mortified afterward.

Akatsuki Osawa

Akatsuki is the person entrusted with Miu by her dying father.

Their relationship begins under painful circumstances, since he is also the one who defeated Garius.

At first, Miu is emotionally conflicted about living beside him.

Later, she comes to trust him deeply and chooses him as the center of her new life.

Their bond eventually becomes so strong that she swears herself to him eternally.

In later developments, their adoptive sibling relationship becomes more intimate than that of ordinary lovers.

Chikage Izumi and Kuzuha Domoto

Miu becomes close friends with Chikage Izumi and Kuzuha Domoto after Akatsuki helps create the opportunity.

These friendships help her adjust to school life and ease her fear of being alone.

Miu’s manifested weapon is the Holy Scepter.

As someone with hidden divine power, she is far more important to the world’s power structure than she first appears.

Her existence is central to the Y Project pursued by Cocoon.

This makes her both powerful and dangerously valuable.

In the anime version, Miu goes to the beach with the others.

When she learns that winning Haruka Nanase’s swimsuit tag game comes with prize money, she aims to win so she can repay the people who have taken care of her.

However, she steps out of bounds and is disqualified.

Her good intentions end in disappointment.

In the OVA, Miu wants to do something about her flashy battle outfit.

She works with Kuzuha Domoto on image training in hopes of changing it.

The more she imagines possible designs, the more absurd the results become.

Some of what she materializes is not even related to battle gear at all.

In the end, she fails to create the battle outfit she actually wanted.

The whole attempt concludes with her in despair.

Miu is described as the first woman whose breasts and completely naked body were fondled by Akatsuki.

This is presented as part of the series’ provocative and fanservice-heavy tone.

She stands out as a mix of vulnerability, hidden cosmic importance, and romantic devotion.

That contrast is a big part of why she remains one of the most memorable heroines in the series.