The worst calamity humankind has ever faced... Shadow Realms have ravaged the earth and decimated almost everyone in their way. The survival of humanity hinges upon the success of just six mages, including analytic fighter Desir Herrman. The remaining heroes make one final stand to end the bloodshed...but to no avail. Desir closes his eyes on what should be the end of his life—only to open them and see the beginning of his school days?! Desir has returned thirteen years back to the past, where he’s been given another chance. A chance to see the loved ones he lost, a chance to meet his fellow warriors again, and a chance to save the world…! (Source: Yen Press)

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? (Source: Tapas)