I have a secret that I can't tell anyone. Akira transferred into the class that Sayho is in charge of. As the test approached, they started tutoring together and their relationship deepened. One night, while overhearing Nao arguing with her husband on the phone in the staff room, Akira decides to cheer up Nao by inviting her to karaoke. On their way back, she confesses, 'I like you'... Moved by Akira's sincere feelings, Nao accepts the forbidden relationship. Then, I started to repeatedly have sweet after-school dates with my older girlfriend Nao...
