Will the hero violate school rules? (Volume 1-4)

the publisher:
Author: Arima Range
Size: 128mm x 182mm
Number of books: 4
Language: Japanese
Category: Shonen manga, manga
Latest publication date: 2023-02-17

Synopsis:
The strongest hero is a modern high school student!?

Ogast, a hero who challenged the Demon King trying to destroy humanity, is annihilated with his friends.
Instead, the courage of modern Japan and kindergarten suddenly regains memories as a hero.
Furthermore, he learns that the Demon King is trying to reincarnate to destroy this world.
As a high school student, Yuu will make a "hero club" and work to gather old friends in preparation for an emergency ...?
Battle comedy occasionally occasionally unfolded by former hero who attends high school!