Ryo Amakusa is both exceptionally good looking and amazingly skilled at his job. However, he's horrible with women.
One day at the train station he's helped by a high school girl after nearly falling down the stairs. He's shocked to later find her in his house and to learn she's his sister's best friend, Ichika Arima. Ryo offers kisses and dates as thanks but is swiftly rejected, "That's disgusting. You want to give yourself as thanks for something? That's weird."
Ichika turns out to be completely different from other women in Ryo's life. Ichika's cold attitude both shocked him and attracted him; before now women always seemed drawn to him and he never had to try. Ryo tries everything to convince her to give him a chance, but Ichika only sees him as a creepy, perverted stalker and makes sure he knows it.