Koi to Yobu ni wa Kimochi Warui

Koi to Yobu ni wa Kimochi Warui (恋と呼ぶには気持ち悪い, lit. It's Disgusting to Call This Love) is a Japanese manga series written and illustrated by Mogusu. The series has been running on pixiv Comic's web manga site comic Pool since 2015. An anime adaptation has been announced.

Plot
Once you fall for someone, you can't stop the love. A strange encounter spurs the meeting of Amakusa Ryou, a high spec businessman who's loose with women, and his high school sister's best friend, Arima Ichika. From there he falls madly in love. On the one hand, he approaches her with almost too straight-forward methods, while she responds simply disgusted, insulting him without hesitation... and he takes it as her way of showing love.