Zhou Bei, a former delivery worker, unexpectedly passes the entrance examination for the Demon Extermination Bureau. He initially believes he has landed a dangerous job filled with flashing blades and fierce battles against demons. But to his utter surprise, the Bureau's wanted S-rank evil spirit is his deceased roommate, the A-rank fox demon is his own landlord, and the B-rank berserk werewolf is an old friend. While everyone else fights demons on their missions, Zhou Bei spends his time enthusiastically reconnecting with familiar faces. Naturally gifted with an affinity for supernatural beings, he is entrusted with an important mission and becomes a liaison officer for non-human creatures, mediating their everyday squabbles. When an ultra-S-rank evil entity capable of destroying an entire city descends upon the world, Zhou Bei doesn't raise his sword. Instead, he gathers all his demon friends across the city and chooses to fight the deepest despair and resentment in the world with shared memories and empathy.