cranberryspice's manga / #demon(3)

After the death of his beloved girlfriend, police officer Kyungjoon just wants to be left alone to water his house plants and catch criminals. But after a police investigation into a mysterious cult goes supernatural, Kyungjoon finds himself unwillingly caught up in a world of demons, succubi and monsters - and the worst of them all is a demon king calling himself "Lord Cain." It turns out that in order to survive, Cain needs mana that can only be accessed through a "door" inside Kyungjoon. The problem is... how is he planning to open that door?

During the day he’s an administrative university assistant, but by night, Shin Dowoon works as a demon hunter. Before him appears a promiscuous incubus in the form of a human student named Lee Hayoon. Hayoon offers a contract in return for letting Dowoon capture him.

After a debilitating war against the human kingdom, Hell has lost its power and glory, and even ran out of money to pay its demon soldiers and servants. Even the Demon King, Hel, relies on two of his most loyal servants for livelihood. To bring Hell back to its golden days, Hel decides to become independent and earn enough money on his own to save his kingdom from financial destruction. He decides to start his first job ever at a Knight's Private Club in the human world. Now, he has to work and survive in an unfamiliar place with his customers, many of whom used to be his enemy.