A handsome office worker named Ryo Amakusa was rescued by a high school girl named Arima Ichika one day. After returning home, he found out that the girl was actually his sister's friend. Moved by this, Ryo began to pursue Ichika directly and fiercely, but his frivolous personality frequently aroused Ichika's disgust, and she mercilessly complained about this series of courtship actions. Ichika originally thought that Ryo was a frivolous man with complicated relationships with women, but after getting along with him, she gradually discovered that Ryo actually had a gentle and loyal side.