I was so sure that the diagram I drew was flawless! and now because I forgot to close a corner I've lost my body and become a dungeon? what the hell is a dungeon anyway!

a powerful wizard seeking a way to resurrect the woman he loved finds himself a victim of an accident and becomes a dungeon who can't even use magic. In spite of it, as long as he keeps on growing bigger and building environments for monsters, he might have a chance to bring her back.