Manga by author Miura Hiraku

From Girls' Generation Scanlations:He's perverted, malicious, a devil that calls himself 'Ore-sama'.His true character is -? The Demon King, Char, from a parallel world called Avalon, fell in love with the daughter of a shrine, Hashiba Rin. Both their hearts and bodies have been entrusted to each other, but a first love, Shou-chan, confesses to Rin-?

From StarryHeaven:Hashiba Rin lives together with her grandpa. One day, while she was praying to the gods at a shrine, a devil calling himself Char appeared. Char who seeks the "blood of a virgin" is perverted, ill-tempered, and pompous. He isn't very straightforward, but the truth is that his kind touch is full of love, and while knowing an unforgivable a love before he knew it, his heart and body grew weak...

When work gets her down, overwhelmed office worker Chikage turns to her one and only pick-me-up: her favorite pop star, Satoi. She'd always admired her fave from afar as one of his countless fans, but who would have thought he was actually her neighbor?! And just what will happen when an unexpected series of mishaps leads to the two of them sharing a kiss...?