Childhood friends Tsukushi and Emiri, who had feelings for each other, were separated for a while when Tsukushi transferred to another school. After some time passed, the two met again, but Emiri had a new lover named Mio-sensei, her homeroom teacher. And even though Emiri is there, Sensei also hands over Tsukushi. The two who knew the fact called the teacher .... A forbidden love affair between a teacher and two students.