Shouya Kiryuu

Shouya is a delinquent youth who has been causing trouble since childhood, relying on his father's power and influence. His father is a wealthy man with deep political connections and the owner of "Kiryuu Fitness School," a comprehensive sports gym chain with locations nationwide. He is currently attempting to take over the "Hayama-style Karate Dojo" managed by the protagonist's grandfather.

In truth, Shouya is the son of his father's first wife. He harbors complex emotions regarding the fact that his younger half-brother, born to his father and his second wife, is doted upon and beloved by the rest of the family.

While he inwardly loathes his father for covering up his misdeeds and acting as if they never happened just to protect his own reputation, Shouya finds himself developing an increasingly twisted affection for Aina, who is the only one to confront his actions head-on.