A terrible incident occurred at Kuroyuri Academy, where Iroha is the principal. Two Iroha had their babies aborted at the same time, and both of them voluntarily withdrew from the school. The incident became a topic of conversation in the public. To think of a solution, Iroha called their homeroom teachers, Natsuho and Hana, to the principal's office. While discussing sex education for students in the principal's office, the three of them got excited and got into some kind of erotic mood...