医者を志す直樹の姿を見て、自分自身を省みた琴子はなんと教師を志望! 2週間の教育実習で訪れたのは、なんと直樹の弟･裕樹のいる斗南中だった。もちろん、琴子の母校でもある。裕樹は｢絶対に、僕と一緒に住んでるなんて言うな｣というけど、裕樹のいるA組の授業で、琴子は生徒たちの大爆笑されてしまう。 Seeing Naoki aiming to become a doctor, Kotoko reflected on her own self and decided to aim to become a teacher! And the first two weeks of teaching practice was at none other than Naoki's little brother Yuuki's school, Tonan Junior High! This is of course, also Kotoko's old school. Yuuki tells her to "Never tell anyone that I'm living in the same house as you", but at his homeroom A Class, the students laugh at her during a class.