Koiiro Devil

 Koiiro Devil by 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-?

Read manga here:  Koiiro Devil

Iya da nante Iwasenai

Iya da nante Iwasenai by Nanajima Kana.

Anzu currently works part-time at a beach house however when it comes to serving male customers, she can't help but be cold and shy. When she accidentally spills a drink on one of them, a male co-worker saves her who ends up being her childhood friend Rei. Anzu is happy to reconnect with Rei, however, Rei might be after a bit more...?

Read manga: Iya da nante Iwasenai