Matsuri had lived her days peacefully, until one day she met her big brother's friend, Asahi Ryunosuke in a completely unexpected way. After a series of awkward events, they become closer. Now her days passed with the super popular "Asahi-senpai" teasing her to no end.

From Summer Rain: Asahina, a member of the library committee is made to supervise her kouhai, Hayama, who is on probation for hooking up with a fellow student. As time passes, they become friends and maybe more...?