After a freak accident, Hitoya is reincarnated from the modern world into a game-like “dungeon” world—as a monster.

It was a cruel, unjust world where monsters were hunted by humans and relentlessly exploited for their materials.

“I want to protect my friends…”
That singular desire leads him to his awakening!!

Now an irregular Dungeon Boss, he aims to create an SSS-Rank, absolutely unbeatable dungeon that no one can ever conquer!!