Yukihime brings Tota and Kuromaru to UQ Holder HQ where they meet a whole team of immortals like them. As new recruits, they are shown a cold shoulder. To earn respect and become full-fledged members of UQ Holder, they must pass an initiation test. Without any warning, Tota and Kuromaru are dropped into a murky underground maze. Their mission: to escape from this dark monster-infested labyrinth within eight years. Tota says he'll get out in a week. Can Tota beat the odds?