On the planet Thebes, she was the ultimate necromancer, revered as a Commander and the living embodiment of death.With the help of Cerezia, Baek Eunha managed to force her way back to Earth using her own strength. However, the dimensional crossing came with severe side effects: she lost every ounce of her power, her body reverted to that of a fragile young girl, and she developed a crippling case of social anxiety.While hiding from the world, Eunha stumbles upon an internet broadcast hosted by Song Hayeon, a rookie necromancer. By offering expert advice in exchange for a mana stone filled with Aura, Eunha makes a game-changing discovery—she can still wield necromancy as long as she can source Aura from external means.Before long, she becomes entangled with Helena, an S-Class Hunter and fellow necromancer. Through Helena, Eunha learns that her god-like power didn't vanish; it was merely sealed by a mysterious force. When a Status Window suddenly manifests before her eyes, the path forward becomes clear: if she wants to reclaim her former glory, she needs to level up.The Monarch of the Underworld, who conquered death itself, has finally returned to Earth....Too bad the side effects of dimensional travel turned her into a Loner Loser Necromancer.