For high school student Eita Kidou (voiced by Ryouta Oosaka), the right thing should be done at the right time. The love that everyone longs for is simply nonsense. Study and grades are the top priority. It is such an old-fashioned man who lives a peaceful and fulfilling life with his childhood sweetheart Chiwa Harusaki (voiced by Chinatsu Akasaki). Although Eita is so upright, he was indeed a pure middle school boy in junior high school. When he was seriously ill, he even wrote his fantasies in a notebook. Unexpectedly, it was this notebook that made him become a "slave" who was used at will by the recognized white and rich beauty Masaki Natsukawa (voiced by Yukari Tamura) in the academy. At Masaki's "request", Eita became her boyfriend. Since then, the introverted "ex-girlfriend" Himeka Akishino (voiced by Hisako Kanemoto) and the frank and honest "fiancée" Ai Fuyumi (voiced by Ai Chino) have also appeared by Eita's side one after another.