The custodian is not a hero.

It's a partial academy otherworld summoning, but the protagonist is a janitor. A certain genius girl at a magic academy accidentally summons dozens of students and teachers along with herself to another world. In the process, the power that was supposed to be obtained is stolen by a certain student—a ordinary janitor (contract not renewed after three years. After graduating from a third-rate private university and failing to find employment, he's managed to survive on temporary and contract work. 25 years old, in his second year as a janitor, with a take-home monthly salary of just under 120,000 yen). A god, taking pity on the janitor who was robbed of his power, grants him a wish. What does the janitor wish for...? ※Currently serializing comic electronic editions on Piccoma. Comics volumes 1-2 are on sale from Frontier Works. ※Published as a novel by MF Books. Completed in volume 8. No deletions or digest versions. ※Completed; original work 'Otherworld Train: Views from the Window ~How a Used-Up Hero Gets By~' https://ncode.syosetu.com/n3283ep/