This is the fourth volume of the I'm Quitting Heroing: Next Gig Is at the Demon Queen's Castle manga adaptation.
Synopsis[]
The officially employed hero, why not attack the dungeon! Leo is the hero who was officially employed by the Demon Army in order to coexist with humans. However, the next challenge was the underground dungeon built inside the castle. He's in trouble with a trap full of color? The Demonheart's journey has been restarted. -!?