User blog comment:Bennia Lover/Other media discussion/@comment-26709288-20170605023135/@comment-29963364-20170605024158

There's...


 * Hagure Yuusha no Estetica (Aesthetic of a Rogue Hero)
 * The MC, Akatsuki Ousawa, was summoned to an alternate world where magic exists. But instead of the story being about his journey to save the world, this story starts after he saves it, and he returns to his original world. And not only does he keep his special powers, he brings someone along with him... the daughter of the Demon King he killed, Myuu.
 * Also, it turns out that the whole "teenagers being summoned to other worlds and gaining special powers" thing has been going on for decades now, and there are schools that these kids go to when they return. Akatsuki enters this school along with Myuu (who is disguised as his little sister, Miu Ousawa), and stuff happens.