OVA of Koihime Musou in a school environment, where factions of 4 individuals fight off in school athletic events to obtain the positions of Student Council seats.

In a futuristic society, Japan has implemented a complex system referred to as The Red Threads of Science to encourage successful marriages and combat increasingly low birthrates. Based on a compatibility calculation, young people at the age of 16 are assigned marriage partners by the government, with severe repercussions awaiting those who disobey the arrangement. For Yukari Nejima, a teen that considers himself average in every way, this system might be his best shot at living a fulfilling life. However, spurred by his infatuation for his classmate and long-time crush, Misaki Takasaki, Yukari defies the system and confesses his love. After some initial reluctance, Misaki reciprocates his feelings in a moment of passion. Unfortunately, before the two can further their relationship, Yukari receives his marriage notice. He is then thrown into a confusing web of love and lies when his less-than-thrilled assigned partner, Ririna Sanada, becomes fascinated with his illicit romance.

Yuuki Oojima is a member of his high school's Food Research Club, whose main activity is eating snacks bought with funds allocated to them by the school. However, this peaceful and wasteful lifestyle is under threat as the upcoming student election draws near. Satsuki Shinonome, a major candidate and the head of the department of financial affairs, campaigns on a platform that includes disbanding meritless clubs such as the Food Research Club and redirecting their budgets to proper ones. Understandably, the Food Research Club is in an uproar over this development, with president Chisato Sumiyoshi vowing to preserve it. But what can they even do to stop the highly competent and popular Satsuki from getting elected?

Atop a hill overlooking a seaside port sits a boarding house named Coquelicot Manor. Since the building is run by her family, Umi Matsuzaki carries out many of the duties involved in managing the small establishment, such as preparing meals for her fellow boarders. When she isn't at home, she is a student at the local high school—one that is currently dealing with a small crisis. In anticipation of the upcoming Olympic Games, a beloved old clubhouse is set to be demolished to make way for a modern building. As a result, a large part of the student body has banded together, working tirelessly to prevent this from happening. Umi finds herself helping the newspaper club to spread information about this cause where she befriends Shun Kazama, whom she gradually begins to fall in love with. But Shun is an orphan who doesn't know much about his origins, and when the two begin searching for clues to the boy's past, they discover that they may have a lot more in common than either of them could have thought. [Writtten by MAL Rewrite]