Genesis of Eden

Eve is a demon tasked with going to the human realm to find an 'important item'. He doesn't know what exactly he's looking for, but to entertain himself during his search, he toys with the residents of the human world. One day he meets Rei, an exorcist who witnesses his murder at the hands of another demon. To Rei's horror, Eve revives and attacks him with the intention of ending his life. Something sparks between them, and their worlds begin to unravel, their fates twisting and intertwining more than they could've imagined.