Ano Ko wa Kawaii Soine-chan

Kazuma Yahiro is a responsible and straight-laced businessman who just happens to be in love with Haru Mikami, her angelic smile, and her ever-friendly demeanor with everyone... Kazuma's certain Haru would never even think of him that way, until she takes him home after a night out drinking with their colleagues! After she runs him a bath and lies in bed next to him, Kazuma can't help but wonder if she's trying to send him a message. After lying there in anguish for some time, he decides to make a move!!

(Source: Renta!)