Akira Amami is a significant character who serves as the apprentice to the Oni known as Ibuki. Her life is profoundly shaped by tragedy, as her parents were killed by the monstrous Makamou. This loss is the primary motivation for her decision to abandon a normal life and dedicate herself to becoming an Oni, driven initially by a deep-seated desire for revenge and to grow strong enough to prevent such pain from happening again.

At the start of her journey, Akira is characterized by a cold and somewhat brusque demeanor, which stems from her intense focus on her dangerous duties and the isolation that comes from missing school and social activities. This attitude is particularly evident in her early interactions with Asumu Adachi, a boy her own age who becomes entangled in the world of the Oni. She views him as a naive outsider and a distraction from the serious, life-or-death nature of the fight against the Makamou. However, through repeated encounters and shared experiences, her attitude softens. She begins to see Asumu not as a burden but as a peer, and their friendship helps her grow, making her more open and self-aware.

Her relationship with her master, Ibuki, is central to her story. It is a complex bond of deep respect, gratitude, and effective partnership in battle, but also one marked by unspoken tensions. As her training progresses, Akira becomes frustrated by a perceived lack of advancement and begins to fear that her initial motivation for revenge is fading. This inner turmoil is exacerbated by the criticism of another apprentice, Kyousuke Kiriya, and the advice of senior Oni like Zanki, who warn her that holding onto hatred is a dangerous path that can lead to darkness. Feeling lost and believing her masters cannot understand her personal pain, Akira is tempted by Shuki, a fallen Oni who has been consumed by her own vengeance. This arc represents a critical point in Akira's development, as she flirts with following the same destructive path.

Ultimately, Akira decides to leave her training and abandon her quest to become a full-fledged Oni. This is not a decision born of failure but of profound self-realization. She comes to understand that continuing to fight would require her to let go of the cherished memories of her parents or risk being entirely consumed by her hatred for the creatures that killed them. Her choice is to preserve the love she has for her family and live with their memory, rather than let it be the fuel for an endless cycle of violence. Even after parting ways, she remains deeply grateful to Ibuki, hoping to pass on the lessons he taught her to others, ensuring her time as his student was not in vain. She eventually channels her desire to help others into a new path, finding fulfillment in performing panel theater for social welfare.

In terms of abilities, though she is a trainee and only briefly takes on a transformed state, Akira is a highly capable and invaluable support for Ibuki. She demonstrates proficiency in deploying and controlling Disc Animals, mechanical devices that assist in reconnaissance, combat support, and freeing her master from enemy restraints. Her bravery and quick thinking in the field mark her as a true partner to Ibuki, even before she has mastered the power of an Oni.