"Why don't you come to my house? I'll do your homework for you!" At school, the teacher is kind and trusted by the students. [In reality, he is a perverted teacher who only thinks about having sex with his students] The teacher invites the students to his house and pretends to be enthusiastic to teach them. He takes the opportunity to touch her crotch and check her reaction... (This guy is good!) The dangerous homework escalates due to the unexpected big breasts of his student. "Mai-na is a pervert, so it's hard for the teacher." The teacher's younger brother, who lives with him, also has his eye on him, and the perverted brother and sister "take turns" begins.