RELTREE

The Primordial Core’s an unconquerable dungeon, the lair of the most powerful monster ever to exist, the Original Monster, the incarnation of evil—Swallow... who happens to be a lazy boss monster who just wants to sleep. Taking care of this lazy bum is Renee, a homunculus maid whose obsession with Swallow knows no bounds. At this point, the only one keeping the dungeon running is Patrick, the last brain cell of the bunch—and he’s a skeleton! Will Mr. Swallow get any rest amid all this chaos?

Deep within the most infamous dungeon, the 'Primordial Core', lives the worst boss monster of all time. Its the story of the struggle of a boss monster who just wants to rest.