FUTARIME NO OUJI-SAMA

Koharu is in love with her venture IT company's president Ayato. She's on bad terms with his beloved cousin, the genius programmer Yuiya, though, because she's convinced Yuiya is trying to get in her way. However, when he helps her with an important presentation, she starts seeing him in a different light...
(Source: Clairparfait)Included one-shot: Amai Kioku wa Nioitatsu