Koikimo

On a rainy day, salaryman Amakusa Ryo is saved at a station by a girl he doesn't know. He soon discovers the savior is Arima Ichika, a high school student. A known womanizer, Ryo tries to repay her act with a kiss or a date, only to be told by Ichika that he's creepy. This moment marks a turning point, and Ryo falls madly in love with her. From then on, he floods Ichika with exaggerated demonstrations of his affection, while Ichika responds with insults and insists he's creepy, though he seems to interpret her taunts as a sign of affection.