In Hell, an imp named Blitzo is the boss of I.M.P. (Immediate Murder Professionals), an assassination company that runs with help from an ancient grimoire obtained from the demon prince Stolas.

Alongside his ragtag crew – weapons specialist Moxxie, assassin Millie, and adopted daughter/receptionist Loona – Blitzo takes on contracts to kill targets in the human world. Balancing their work with personal lives, the team constantly finds themselves in absurd, violent, and darkly comedic situations.