Banri Tada, a freshman law student at a Tokyo university ended up arriving late for his entrance ceremony. Not knowing how to get to the university, he discreetly followed two other students, and meets Mitsuo Yanagisawa, another freshman, who quickly befriended him. As they made their way to their orientation, they were greeted by a beautiful young woman, who presented Mitsuo with a bouquet of roses and then proceeded to smack him with them before leaving. Mitsuo later explained that the woman was Kouko Kaga, his childhood friend, and arranged fiancé, whom he had run away from as he does not reciprocate her feelings. After orientation, Banri and Mitsuo learn that Kouko was also a student at their university, much to Mitsuo's horror. She became acquainted with Banri during a shared class, and he soon became smitten. After class, Banri met and befriended freshman Chinami Oka and Linda, a second year student and member of the Japanese Festival Culture Research Club. On his way home, he once again runs into Kouko, who used his phone to locate Mitsuo, but upon returning it, he noticed 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. (Source: Wikipedia)

After Linda finds them, she explains that she was out on a club retreat with the Festival Club, and brings Banri and Kōko to their campsite. After returning, Banri is greeted by Nijigen, Mitsuo, and Chinami, who are all relieved to know they are alright. Later during a break, Banri, Mitsuo, and Chinami get together to talk, but they are interrupted by Kōko, who begins to berate and belittle Chinami, causing Mitsuo to leave with Chinami and leaving Banri to comfort a remorseful Kōko. After class, the pair once again encounters Linda, who invites them to participate in one of the Festival Club's dance rehearsals. Banri decides to join, while Kōko considers the idea. Later that night, Mitsuo tells Banri he will settle things with Kōko, because he wants to pursue a relationship with Chinami, and the next day Mitsuo flatly rebuffs Kōko's affection in front of Banri. Kōko asks Mitsuo if their time together meant nothing to him, and Mitsuo replies that while he treasures their time together, he only sees her as a childhood friend. Kōko angrily yells at him to forget their history, driving Mitsuo away. Kōko yells at him to disappear, but realizes her words are hurtful to Banri, causing her to continuously apologize in tears. After a few hours, Kōko and Banri are invited by a girl called Nana (most likely a reference to Nana Osaki from the manga and anime NANA) to her concert. Kōko goes to vent her frustration, but is thrown out, and spends the night at Banri's apartment. Kōko reveals she needs him, while Banri confesses his love for her. After she leaves, she texts Banri, encouraging him to not forget about his lost memories, which motivates him to return to his home in Shizuoka, where he finds a scrapbook containing pictures of himself and Linda in high school together.

(Source: Wikipedia)