Youmuin-san wa Yuusha ja Arimasen node

A brilliant young girl, whose power far outstripped her judgment, accidentally summons dozens of students and teachers into a perilous world of monsters and magic. Yet the story's true protagonist is neither a student nor a homeroom teacher—it is the school janitor. At the moment of summoning, every student and teacher received a unique ability born from their soul. The janitor, however, was left out. Just as a protective power was about to be granted to him, an arrogant student forcibly seized it away. He is twenty-five, a contractor for three years without a renewal, a two-year veteran of mopping floors. A graduate of a third-rate university, he has failed to find stable employment, and his monthly take-home pay is less than 120,000 yen. Rejected by society, he is now thrust into a world that rejects him just as coldly. But when a goddess takes pity on him, the janitor makes a single wish—and that wish will change everything.