Tsumugi and Yuki are secretly dating each other. Thanks to their relationship, Yuki helped Tsumugi become a homeroom teacher at his school. Yuki proposed to Tsumugi, but she is not ready yet because she still has many things she wants to do. However, Tsumugi was being stalked by a creepy janitor. He placed hidden cameras to film her using the restroom, changing clothes. He even took a discarded sock of Tsumugi's home to masturbate with. As it was her first time being a homeroom teacher, Tsumugi had a lot of work to do, so she stayed at school very late. The janitor then brought her a bottle of water, and Tsumugi drank it without suspecting anything. As a result, she quickly lost consciousness and collapsed. Seizing the opportunity, the janitor took advantage of her and filmed it, threatening to release the video if she did not obey. From then on, Tsumugi had to comply with all his perverted demands, allowing him to ejaculate into her uterus repeatedly. Knowing that she might become pregnant, Tsumugi took the initiative to invite Yuki to ejaculate inside her.