Mitsuya and Naruki are two co-workers who share a secret: in a previous life, they were a devil and an angel who were thrown out of heaven after committing a grave sin. Now forced to live the lives of office workers in the hopes of getting reaccepted into the heavenly world someday, Mitsuya has one specific problem... Naruki won't leave him alone! Nothing brings the former angel joy like using his powers to play pranks on Mitsuya, but one day, after taking things too far, Mitsuya is plagued by headaches and passes out due to a lack of demonic energy... Luckily, Naruki is there to help. The solution? Why, the horizontal tango, of course! Will Mitsuya ever get back into heaven at this rate? The tumultuous love story of an angel and devil cast out from the celestial realm!