Yui, a cute college girl with a peachy butt, was in a pure and loving relationship with her boyfriend Yoshiki, who is active in the soccer team at the same university. One day, when she dropped by her boyfriend Yoshiki's house, his father greeted her warmly. It turns out that Yoshiki's family has been a single-parent household for quite some time, and that he lives with his father, who runs a company. That night, Yui's father kindly let her stay the night. She woke up in the middle of the night to get a drink...