The Boy Trained by the Demon King and the Dragon King, Shows Absolute Power in School Life (WN) (Associated Names)

A young man named Lucious is trapped in a distorted space created by the ancient hero. What he finds there is the Demon King and the Dragon King, who should have been defeated by the hero 300 years ago. Lucious befriends the Demon King and the Dragon King, and is trained by them, going from…