The Primordial Core is the most infamous dungeon in existence, guarded by the worst boss monster of all time: the Devourer. Despite his terrifying reputation, the Devourer is actually a lazy being who would rather doze off than fight brave adventurers. However, because his dungeon is so high-profile, he is constantly pestered by human raiders and nagged by his own subordinates to act like a proper final boss. Forced to deal with the constant influx of humans at his doorstep, he must maintain his fearsome image while trying to minimize his workload. His journey is a comedic exploration of a boss monster's daily life as he outmaneuvers heroes not with malice, but with a desperate desire for a vacation.