TV-Series
Description
Kyōya Yaguchi hails from Ibaraki Prefecture, north of Tokyo. He possesses a handsome appearance marked by golden brown hair, brown eyes, and multiple piercings on both ears. He frequently adorns himself with watches, bracelets, chains, and rings.

His personality revolves around self-indulgence and hedonism, leveraging his physical attractiveness to manipulate and seduce women. Kyōya openly justifies polygamy, professing equal affection for all partners without favoritism. Despite a pleasant outward demeanor, he exhibits deeply manipulative and morally compromised tendencies, described as "rotten to the core" by Sayu Ogiwara. He avoids confrontations, displaying cowardice when challenged. However, he adheres to a personal code, such as honoring promises of confidentiality under duress.

Kyōya encountered runaway Sayu Ogiwara (using the alias "Miyuki") outside an Ibaraki convenience store. Recognizing her situation, he offered shelter in exchange for sexual favors. They briefly cohabitated and engaged in intercourse. He later expelled her when she interfered with his simultaneous relationships with seven other women. Exposure of his infidelities by one girlfriend caused all partners to leave him, prompting his relocation to Tokyo where he secured work as a convenience store clerk.

In Tokyo, Kyōya crosses paths with Sayu at their shared workplace. Despite their fraught history, he refrains from disclosing her background to others. During a confrontation with Sayu’s searching brother, Issa Ogiwara, Kyōya assists her in hiding. He criticizes Issa as "someone who uses authority to control others," demonstrating a residual protective instinct.

His relationship with Sayu remains defined by exploitation and transactional dynamics. She views him as predatory and morally detached, citing his inability to recognize wrongdoing in their past arrangement. Their Tokyo interactions remain strained, showing minimal reconciliation or personal growth on his part. Kyōya also interacts with assertive colleague Asami Yūki, whose personality earns his deference—unlike his typical treatment of women.

Kyōya’s character lacks significant development across official media. He remains consistent in his self-serving behavior, though occasional actions—like aiding Sayu against her brother—hint at unresolved complexities within his ethical framework. No substantial evolution or redemption arcs are depicted.