"AOKANA: Four Rhythm Across the Blue" is set in a world where the sport of Flying Circus (FC) has become a popular competitive activity. FC involves participants using anti-gravity shoes to maneuver through the air, competing in speed and skill. The story centers around Masaya Hinata, a former FC prodigy who has lost interest in the sport after a personal setback. His life takes a turn when he encounters Asuka Kurashina, a transfer student with a natural talent for FC but no formal training. Asuka’s enthusiasm reignites Masaya’s passion for the sport, and he becomes her coach, guiding her through the intricacies of FC.

The narrative expands as Masaya reconnects with his childhood friend, Misaki Tobisawa, who is a skilled FC player and a member of the school’s FC club. Misaki harbors unresolved feelings for Masaya, adding a layer of emotional complexity to their interactions. The group is further joined by Mashiro Arisaka, a shy and reserved girl who initially struggles with self-confidence but gradually finds her place in the FC world through her determination and the support of her friends. Rika Ichinose, a rival FC player with a competitive edge, also plays a significant role, challenging the main characters and pushing them to improve.

As the story progresses, the characters participate in various FC tournaments, each facing personal challenges and growth. The series explores themes of perseverance, teamwork, and self-discovery, with the characters striving to overcome their individual limitations and achieve their goals. The dynamics between the characters, particularly their friendships and rivalries, drive much of the narrative, creating a blend of sports action and interpersonal drama. The culmination of their efforts leads to a climactic tournament, where the characters’ growth and resolve are put to the test, highlighting their development throughout the series.