Yashiro, a skilled leader of the Shinsekai mafia, hides his secret persona as a sadomasochistic deviant. After a heartbreak, Yashiro decides to only partake in physical relationships. However, his superior assigns Chikara Doumeki, a recently freed inmate, as Yashiro's new bodyguard. Yashiro is displeased to learn that Doumeki is stoic, observant, and may be impotent. Despite Yashiro's personal rule against any romantic relationships with colleagues, he is drawn to Doumeki who refuses his advances. Doumeki knows he cannot fully satisfy Yashiro, but he remains captivated by him and resolves to stay by his side. As their bond strengthens, their pasts resurface, threatening their blossoming relationship.