TV-Series
Description
Kayoko Onikata is a third-year student at Gehenna Academy and the section chief of the problem-solving club known as Handyman 68, though she holds this leadership position somewhat reluctantly. At eighteen years old, she is noted to be one of the oldest confirmed students within her school, which has led to occasional speculation about her academic history, but no definitive information is provided. Her appearance is a constant source of misunderstanding for those around her. With white hair featuring distinct black bangs tied into a ponytail and piercing red eyes, her natural facial expression is often interpreted as angry or intimidating. This is compounded by her fashion sense, as she typically wears a black hoodie bearing the logo of her favorite heavy metal band, Black Death Poison, alongside a pleated red skirt and black sneakers. She carries a distinctive two-tone Heckler & Koch P30 pistol fitted with a suppressor, a weapon she calls Demon's Roar.

Despite her fearsome exterior and quiet nature, Kayoko's true personality is gentle, calm, and surprisingly kind. She is the most sensible and least destructive member of Handyman 68, often serving as the voice of reason who sighs at the impulsive schemes of her colleagues but ultimately follows along with them. She is softhearted and has a particular fondness for stray cats, frequently caring for them in quiet moments. Her inclination toward silence and her reluctance to correct others about her appearance often deepen the misconception that she is a delinquent, creating a cycle where her discomfort is mistaken for hostility. Most of her genuine feelings remain hidden behind a reserved exterior, but she acts with a strong sense of professionalism and ethics. She values hard work and is diligent about her studies whenever she finds the time, contradicting the image others project onto her.

Kayoko did not actively seek out her position within Handyman 68; she joined the group almost by accident as she was swept along by circumstances. However, she has come to find a sense of belonging among her fellow outcasts. Her primary motivation stems from a quiet loyalty to this group and a desire to be useful, even as she is dragged into chaotic and questionable assignments. She is not driven by ill intentions or a desire to cause trouble, unlike some of her associates. Instead, she finds purpose in applying her particular skills to solve problems and support her friends, particularly when her tactical thinking and technical expertise are needed.

Within the story, Kayoko plays a crucial support role as the brain of Handyman 68. She maintains a close but often exasperated relationship with Aru Rikuhachima, the club's more flamboyant and ambitious leader. While she frequently sighs at Aru's over-the-top actions, she truly appreciates Aru's personality and follows her lead. Her other key relationships are with fellow members Mutsuki and Haruka, with her calm demeanor balancing the group's more chaotic energies. Outside the club, her mysterious reputation precedes her; officials like Ako Amau treat her with noticeable wariness, and the Federal Student Council's Nanagami Rin is also aware of her. There are hints that Kayoko has a mysterious past connected to formal or high-ranking circles within Gehenna, including possible ties to a figure known as the Empress of Thunder, but no concrete details about her life before Handyman 68 are ever confirmed. Before joining the group, she spent most of her time alone, and she has since developed a comfortable closeness with her teammates that contrasts with her previous solitude.

Over the course of events, Kayoko shows subtle development in how she interacts with the world. While she still struggles with being misunderstood, she demonstrates a consistent willingness to step out of her comfort zone for the sake of her club. She shows that she can act with chilling effectiveness and independence when the situation demands it, such as during a mission where she had to work alone, proving that her quiet demeanor belies a formidable operative. Through her actions, she reveals a reliable and capable individual who has found a place where her specific talents are valued, even if she would never say so herself.

Kayoko possesses a notable range of abilities that make her indispensable to Handyman 68. She is highly intelligent and quick-thinking, frequently devising strategies and solving problems under pressure. Her technical skills are advanced, particularly with computers and social media, allowing her to track down online adversaries who interfere with the club's accounts. Tactically, she is proficient in sabotage and crowd control, skillfully using explosives, bombs, and smoke grenades to cause panic and manipulate enemy movements. In combat, she wields her silenced handgun effectively, and her very presence on the battlefield can be used to induce fear in opponents, reflecting her naturally intimidating aura. Her calm and methodical nature ensures she remains reliable in the most difficult situations, making her the quiet cornerstone of her team.