Synopsis:

[Back face of Shiiha]
Okura suffered mental anguish while watching girl, Shiiha who was taciturn and was a mystery was at the seat before. The other day to tell you the truth, the scene where she has sex with a father-in-law has been witnessed. Okura was called from that sort of Shiiha after school. When heading for a promised unused classroom though it is puzzled, an extreme invitation from Shiiha...!?

[Imo-torippu]
When Takase returns to the house, younger sister-in-law Miku was looking at hiding erotic DVD. Miku who sees DVD and becomes horny, it approach Takase and started to say "I want to do it", he runs away momentarily. Though it was Takase who ran in the bathroom, Miku comes there and it held out one's arm to genitals of fascinating. ...