He experienced a real hell on earth, lost everything he loved, and at the same time found the goal he struggled for, and paid everything for it, but he didn't die. He was reborn in a strange world, his name was hell, and this is his story.

Flash Sentry is Makai knight. His duty is to protect human beings. The place he guards is called Canterlot. As long as he is there, horror will not be allowed to act recklessly

And in this city, he is not alone, and his other companions, maybe they are immature, maybe not very strong, but they will use everything to protect mankind!