A perverted man breaks into Yuki-chan's house, where she lives alone, and searches her room as it is, just as a normal girl would! The perverted man steals the keys to Yuki-chan's house, a welfare college student. Yuki-chan's house is very messy, especially the pile of unwashed laundry in the washing machine! There are plenty of used, stained underwear, and he admires each piece of them. When Yuki-chan returns home, he plays around with her in her messy, small room and has sex with her. After that, he calls her to a hotel...