This work tells the story of an abnormal educational system called "Semen-Drinking" introduced at a certain school. Under this system, all female teachers are forced to drink students' semen as a cruel method to strictly monitor their physical condition. Newly assigned teacher Yuki Natsume is shocked by the bizarre nature of this system, yet she is gradually pushed into situations where she is forcibly made to swallow semen as part of her daily duties. The film portrays her inner conflict and emotional transformation as she struggles within this harsh environment.