Natsuki's life experiences a big shift after becoming a teacher and starting a salvaging service. Rumors of a school lit with electricity attracts new students, and activities around the school regain a sense of liveliness. 
Not to mention for high schoolers. 
He's basically our age.
،ناهيكِ عن أنّه يُدرّس طلّابَ ثانويّة
إنّه في مثل سنِّنا
Und dann auch noch
bei ’ner Oberstufenklasse.
Y menos de chicos de preparatoria.
Y menos de gente de bachillerato.
Il fait classe à des lycéens
alors que c’en est un, lui aussi.
A dei liceali, oltretutto.
E do ensino médio, além de tudo,
mesmo tendo quase a mesma idade.
Ещё и для старшеклассников.