University student Mukai Tsumugi is openly gay after coming out. It’s my rule to do what I want when it comes to romance and sex, but lately I’ve been addicted to lewd chats with “Chiitan ☆” whom I met online. Just what kind of person is “Chiitan ☆,” the erotic seme whose likes and hobbies match “Chiitan ☆,” what kind of person is he?