Akira Tachibana, a reserved high school student and former track runner, has not been able to race the same as she used to since she experienced a severe foot injury. And although she is regarded as attractive by her classmates, she is not interested in the boys around school. While working part-time at the Garden Cafe, Akira begins to develop feelings for the manager—a 45-year-old man named Masami Kondou—despite the large age gap. Kondou shows genuine concern and kindness toward the customers of his restaurant, which, while viewed by others as soft or weak, draws Akira to him. Spending time together at the restaurant, they grow closer, which only strengthens her feelings. Weighed down by these uncertain emotions, Akira finally resolves to confess, but what will be the result?

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?

It's a quick time jump to the 26th century where a school trip to a rebuilt 21st century city turns into a wild adventure for teenaged Shinichi. While chasing a talking deer that steals his bag, he runs into a strange girl trying to elude even stranger pursuers, and then things get really wild. It's a mad dash through a city of the past as two young people discover a chance at a new future. (Source: The Anime Network)