Story
Aiba Hashiru, summoned to another world as a hero, fought the Demon Lord to a standstill. When he came to, he was back in his own time, in modern Japan, still possessing the strength of the strongest hero. As planned before his summoning, Hashiru began working as a new teacher at a private girls' high school. He thought he could finally lead a normal life—but then he encountered one of his students fighting a bizarre, otherworldly monster in the mountains…!? It further turned out that the school Hashiru has joined is secretly attended by girls who fight in a "hidden world"...!?
Synopsis via AniList (English).
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