A handsome, perfect, but obsessive yandere boyfriend confines and trains his girlfriend to make her understand. Saya is dating Kaede, a classmate from her university days. Even now that they are working adults, the two are still very much in love, but Saya is still unaware of how popular she is. Kaede proposes that Saya be confined and trained for three days while she is off work...!? This is the story of three days in which Kaede, who is still obsessed with Saya, and the two of them spend a loving life of confinement and training together. More sex and an ultra-happy ending!