HUH !? The demon lord fell in love with me?

Elysia is a normal human, and Azazel is the Demon lord of the underworld. Bored with paperwork in Hell, Azazel decides to go to Earth and enjoy life, while Elysia grapples with her average problems with her boss. Both harbor questions and curiosities about love, forming an odd pair that embarks on adventures with the common goal of finding love and testing whether it can resolve their issues.