Isekai kara Kikan Shitara Chikyuu mo Kanari Fantasy deshita. Ato, Make Heroine-domo Kocchi Minna.

Story:

Six years ago, Natsuki Yura was summoned to another world as a hero. After defeating the Demon King and finally managing to return to his original world, he discovered that Earth was actually full of fantasy too—psychics, aliens, angels, gods, you name it.