Banri Tada, a newly admitted freshman law student at a university in Tokyo, is eager to make his college debut, but ends up arriving late for his entrance ceremony. Not knowing how to get to the university, Banri discretely follows two other students, and meets Mitsuo Yanagisawa, another freshman at the same university, who quickly befriends him. As they make their way to their orientation, they are greeted by a beautiful young woman, who presents Mitsuo with a bouquet of roses and then proceeds to smack him with them before leaving. Mitsuo later explains that the woman was Koko Kaga, his childhood friend, and arranged fiance, whom Mitsuo had run away from as he does not reciprocate her feelings. After orientation, Banri and Mitsuo learn that Koko is also a student at their university, much to Mitsuo's horror, and she becomes acquainted with Banri during a shared class, with Banri soon becoming smitten with her. After class, Banri meets and befriends Chinami Oka, a fellow freshman, and Linda, a second year student and member of the Japanese Festival Culture Research Club. On his way home, Banri once again runs into Koko, who uses Banri's phone to locate Mitsuo, but upon returning it, Banri notices the phone number for a hospital, causing him to remember a time when he was on a bridge and was seemingly run over by a motorbike.