START-586 | Homeroom teacher: "Starting today, Shinkawa is on sex duty. If you don't fill the beaker with sperm in one week, you'll be expelled, so do your best." Shinkawa Sora

Sora-chan has been appointed "sex duty" by her homeroom teacher because she hasn't contributed enough to the class. She's told that if she doesn't fill a beaker with sperm in a week, she'll be expelled, so she diligently works to collect semen. At first, she was embarrassed about the duty, but if it helps improve the boys' grades, she'll do her best!