Targeted Young Wife - Abnormal behavior of a man she met at her part-time job

Momo has decided to quit her long-time part-time job. At a farewell party thrown by the manager of her part-time store and Osawa, a young part-time worker, Momo gets drunk and loses her memory. And when I woke up, I was in Osawa's room. Osawa is a serious young man and Momo returns home without feeling anxious. However, right after that, Osawa sends an email with an obscene photo of Momo. Osawa then approaches Momo as if they were lovers. Gradually, it turns into an abnormal behavior...