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. 
About this formula...
...بخصوص هذه الصّيغة
Es geht um diese Formel …
Je bloque sur une équation.
Senta, questa formula...
É sobre essa equação aqui...
Формулу не понимаю.