Keraku no Ou - Season 1

Ryouichi endures a life of isolation and regular bullying, with even his parents having withdrawn support. His circumstances shift when Chihiro, a new transfer student and former childhood friend, joins his class. Unaware that Ryouichi sustained brain damage from an injury during their past play, she is consumed by guilt upon learning of his condition. In her remorse, she pledges to fulfill any request he makes. Ryouichi exploits this offer by demanding sexual acts, which Chihiro feels compelled to accept. He discovers an unexpected prowess in these encounters, equipping him with a potent tool. After years of torment from peers, he now pursues a singular goal: retaliation. Embarking on a lewd campaign, he aims to enslave through carnal means every woman who previously scorned him.