A terrible incident occurred at Kuroyuri Gakuen, where Iroha serves as the principal. Two students simultaneously gave birth to babies and both voluntarily withdrew from school. That incident became a topic of conversation in society. In order to consider countermeasures, Natsubo and Hana, who are the homeroom teachers of the two students, were summoned to the principal's office. While discussing the students' sex education in the principal's office, the three of them, whose feelings were rising, somehow entered an erotic mode…