Koi to Yobu ni wa Kimochi Warui
Ryou Amakusa is a wealthy genius playboy. When he nearly falls off the stairs in the rain, a girl called Ichika Arima saves him. Coincidentally, she turns out to be the best friend of his little sister, Rio.
Ryou decides to thank Ichika with his usual charming moves, but it backfires terribly; she finds his advances creepy and quickly rejects him. Instead of being discouraged, he becomes more determined to win her heart. Will he eventually succeed?