Ryo, a detective who has been treated coldly because he is an omega. The only person who was kind to him was β's senior Terahara. However, while investigating a certain case, Terahara gets involved in an accident and dies. One day, while pursuing revenge on the yakuza "Chikage" who caused it, Ryo, who suddenly goes into heat during the investigation, was rescued by the yakuza Alpha. A body that is violently demanded many times and is squid. Even though he shouldn't like it, "You're important... I won't give you to anyone else..." Ryo gradually finds himself attracted to him, but that man is someone he should never marry...