Welcome to Nightfall, the bustling capital of the Netherworld, realm of the dead. Azalea 'Lea', a member of Unit 636, a squad of demon hunters, is on the cusp of purchasing her Rebirth after three centuries of hunting demons. But when fate takes a wrong turn, Lea finds herself on the run from her own comrades and thrust into a dangerous flight across the treacherous Netherworld.To make matters worse, Lea must team up with an unlikely ally to assassinate the Corrupt Queen, the most terrifying demon in the realm, in order to achieve redemption. But as she delves deeper into the truth behind the balance between life and death, Lea realizes that escaping death will come at a much greater cost than she ever could have imagined. Can she pay the ultimate price to escape death?