Tsumugi and Yuki are secretly dating each other. Thanks to his relationship, Yuki helped Tsumugi become the homeroom teacher at his school. Yuki proposes to Tsumugi but she is not ready, as she has a lot to do. But Tsumugi was followed by a perverted janitor. He set a camera to secretly record her going to the toilet and changing clothes. He even took the socks that Tsumugi threw away and went home to masturbate. Since it was her first time as a homeroom teacher, Tsumugi had a lot of work to do, so she stayed at the school very late. The janitor came over and handed her a bottle of water, and Tsumugi drank it immediately without any suspicion. And as a result, she quickly lost consciousness and collapsed. Taking this opportunity, the janitor immediately took over her body, and he also recorded a video, threatening to spread if she didn't obey. And from then on, Tsumugi had to obey all his perverted requests, letting him cum into her uterus over and over again. And knowing that there is a possibility of getting pregnant, Tsumugi takes the initiative to invite Yuki, let him inside her...