Haruka Nanase and Makoto Tachibana have started middle school and must adjust to the changes that come along with growing up. While Makoto fits in with his classmates and remains positive about swimming, Haruka struggles to befriend others or join his school's swim club, as his previous issues with swimming trouble him. Distancing himself from his lively classmates and the swimming club, he has difficulty deciding which club to join instead. The rest of his classmates, including Makoto, are also hesitant as to which clubs to participate in. After an argument leads them to join the swimming club anyway, the boys strive to hone their skills, harmonize their swimming styles, and refine their conflicting feelings toward swimming and each other. As determination and talent run high, Haruka and Makoto—along with their classmates—discover themselves and improve their talents during their starting days.

Kojirou is the kendo instructor for Muroe High School and he's totally broke. But then an unexpected chance is given to him: his team must win against his senpai's team and the prize is: free meals for a whole year! Now, the only problem left... where to find girls skilled enough and willing to join the kendo team?

Tatsuya Yoigoshi, a once nationally recognized soccer player, is now a first-year student at Noukin High School. Due to his developed hatred for sports, he has abandoned his previous aspirations to become a famous livestreamer on the internet. One day, Souma Azemichi, a first-year on the kabaddi team, seeks to recruit Yoigoshi and spontaneously interrupts his livestream. Without any expectations, Yoigoshi follows Souma to the school gym, where he witnesses second-years Kyouhei Misumi and Shinji Date engaged in the primal contact sport of kabaddi. Despite ridiculing the rules of play, Yoigoshi is stunned by the intensity of the round. Because of an enticing deal and slight coercion, he agrees to settle the prospect of his recruitment through the most invigorating way: a battle of kabbadi, a team sport played empty-handed.

Shoutarou Futaba has always loved sports, but he never became more than a benchwarmer on his middle school baseball team. After noticing a group of gymnasts practicing in the park, he decides to watch a rhythmic gymnastics tournament on a whim. Although displaying an exhilarating performance at the competition, the Shoushukan High School's Rhythmic Gymnastics Club places second-to-last due to penalties acquired from not fielding a full six-man roster. The demonstration of skill captivates Shoutarou, and he decides to enroll at Shoushukan in hopes of joining the team despite having no background in the sport. The club recruits him alongside Ryouya Misato, a prodigal gymnast who was the runner-up in a junior tournament. Now with a full six-man roster, the team sets out to compete in the upcoming Inter-High tournament. As he strives to accomplish this ambitious endeavor, Shoutarou must learn and master the basics of rhythmic gymnastics all while working in tandem with his new teammates if Shoushukan wants to stand a chance at claiming the title.