Koikimo: Koi to Yobi ni wa Kimochi WaruiIt's Disgusting to Call this LoveEP 1

Once you fall for someone, you can't stop the love. A strange encounter spurs the meeting of Ryō Amakusa, a high spec businessman who's loose with women, and his high school sister's best friend, Ichika Arima. From there he falls madly in love.