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)

Kōko tells Banri that she loves him, but before he can respond Kōko is arrested for stealing a bike that she used to catch up to Banri. At the police station, Kōko is cleared of any charges, and after explaining the reason behind her sudden confession, Banri reciprocates and the two officially become a couple. The next day, Kōko openly expresses her love for Banri as they walk to school, and their relationship is met with disbelief from Nijigen, and mild surprise from Mitsuo, who has dyed his hair blonde out of depression from being rejected. When Chinami comes to greet them Mitsuo flees, and Chinami says that he has been avoiding her, while explaining the reason she rejected him was because his confession was made in public. Linda soon appears, and Banri flees, noting that he has been avoiding Linda since their last conversation, despite her constant attempts to speak with him again. As time passes, Banri and Kōko enjoy their time as a couple, but Banri continues to ignore Linda, which upsets her, and causes Nana to take notice. One day, Banri is called back to his apartment because of a plumbing leak, but when he arrives he meets Nana again, who reveals that she is his neighbor, and that she faked the leak to get him to meet with Linda. Back in Banri's apartment, he apologizes for his behavior, and the two rekindle their friendship, just as Banri gets a call from Kōko who worries that Mitsuo might be in trouble.

(Source: Wikipedia)