He thought the real world had neither magic nor a demon kingdom. Natsuno Naoto finds a mysterious creature like a slime that should not exist in reality. Since it was a classic that slimes​ were weak, if you help it, it will follow you to your house.

In a fraction of a second, an university student, Kashiwagi Yuuya was summoned to another world and came back. Time didn't pass in Japan, but Yuuya has completed the quest as a hero in another world and successfully returned. But to his surprise, he stil