From Comikey:
Blade is a carefree transfer student whose only goal is to make friends with his classmates at Rosewood Academy, a school for heroes-in-training. On the surface, Blade seems like an ordinary boy, but he is hiding a miserable secret with seeds that start long ago, with the defeat of the Demon King at the hands of the Great Hero. Join this new class of friends as they unravel the mystery surrounding Blade, and journey toward becoming full-fledged Heroes.

A reboot of Eiyuu Kyoushitsu - Honoo no Jotei.

Official English