Momo has decided to quit her long-time part-time job. At a farewell party held by the manager of her part-time job and a young part-time worker, Osawa, Momo gets drunk and loses her memory. When she wakes up, she is in Osawa's room. Osawa is a serious young man, so Momo returns home without feeling any anxiety. However, right afterwards, she receives an email from Osawa with a lewd picture of Momo. Osawa then approaches Momo as if they were lovers. Gradually, his behavior becomes abnormal...