Ayako Takamine is a beautiful teacher. She’s currently trying to solve the puzzle between Yukiba and Aida,who stopped going to school. But things aren’t going well, and she’s worried. Then, her phone starts vibrating.
“Hey, long time no see, Sensei,” a voice says.
It’s Kito, the janitor she never paid much attention to. He says something unbelievable that shocked Ayako: he’s with Yukiba, who is supposed to be absent. Kito asks Ayako to come to his house. Ayako has doubts, but her strong sense of justice as a teacher starts to push her. She wants to save her students.
Ayako accepts the invitation and finds herself trapped in lion’s cage. Can she resist and save Yukiba?