Because Janitor-san Is Not a HeroYomuin-san wa Yuusha ja Arimasen node; 用務員さんは勇者じゃありませんので; Because Janitor-san Is Not a Hero; Уборщик-сан не герой; Пан прибиральник - не Герой

A certain girl genius with more power than knowledge accidentally summoned dozens of students and teachers into a dangerous world filled with beasts and magic, but the protagonist isnt a student or the homeroom teacher its the janitor.