The main character of Hentai Mikoshiba-kun, by a strange coincidence, got into a sketch club(He accidentally dropped his sketchbook and his drawings attracted the head of the club). He became the only guy who joined it. The head of the club Shibasaki-san is a very strange and at the same time incredibly energetic girl. She has a beautiful body – huge weighty tits of the fifth size, a thin wasp waist and an elastic ass. On the first day, Shibasaki said that she had decided what the club would do in the near future – this choice was the development of an eroge (erotic game). However, to collect the necessary information and high-quality illustrations of sex, you need a guy with drawing skills. Mikoshiba-kun, you can say, became her guinea pig, who had to draw in detail all the depraved actions that happened to him.