The main character of the story, a guy named Yuma Oda, gets a super app on his smartphone called "hypnosis". The hero of course does not believe in a miracle and tries the application on his fellow students... Yuma can't believe his eyes the app really worked! Later, the hero learns that he became one of the testers of the application from the succubus "Aryume Rina". As his main target, Yuma chooses the extravagant gyara classmate Fujimiya, who is famous for her brash character. He decides to make her his personal sex slave...