Seeing Naoki try to be a doctor inspires Kotoko to try being a student teacher! She is invited to work at the same school Naoki’s little brother Yuki goes to, Tonan Junior high. Kotoko also went to the same school. "Don’t you tell anyone that we live together", says Yuki. However Kotoko has become the teacher of YukI’s class. Class A! She is embarrassed by the students.