"Won't you come to my house? I'll give you a special preview!" A homeroom teacher who is kind and trusted by her students at school. [The essence is a perverted mad teacher who only has sex with students on her mind] A homeroom teacher who skillfully invites her home and pretends to teach diligently. Taking advantage of an opening, she touches her crotch to check her reaction... (This one's a go!) Dangerous preview escalates with the unexpected big breasts of her student. "Because Maina is horny, it's tough for the teacher too." She is also targeted by the homeroom teacher's younger brother who lives with her, and the perverted siblings' "taking turns" begins.