The top student Mizuki, along with her classmate's boyfriend, visited the home of their classmate Hiroyuki, who had been refusing to go to school. The serious and kind-hearted girl had come to persuade Hiroyuki to return to school. When the two arrived at Hiroyuki's house, they were greeted by Hiroyuki's father, Kenta. Although Kenta welcomed Mizuki and her companion, it was with the intention of using Hiroyuki as a plaything. Even Kenta's yakuza associates joined in, and Mizuki's beautiful body was thoroughly ravaged…
