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. "e;Don't you tell anyone that we live together"e;, says Yuki. However Kotoko has become the teacher of YukI's class. Class A! She is embarrassed by the students.