Aokana: Four Rhythm Across the Blue

, officially abbreviated as Aokana (あおかな) and subtitled Beyond the sky, into the firmament, is a Japanese adult visual novel developed by Sprite and released for Windows on November 28, 2014. The game was ported to the PlayStation Vita and PlayStation 4, and later to the Nintendo Switch. A manga adaptation began publication in Comp Ace magazine in October 2015. An anime series adaptation, produced by Gonzo and directed by Fumitoshi Oizaki, aired between January and March 2016. A mobile game spinoff was released in October 2016, while a sequel and a visual novel spinoff are currently in production.

Plot
In an alternate universe, shoes with anti-gravity properties are invented called Grav-Shoes, which allow people to fly freely. This leads to the development of a sport known as Flying Circus, where participants either race from one buoy to another or touch the opponent's back to score points. Masaya Hinata is a student at Kunahama Institute, which is located in a four-island archipelago south of Japan. In the past, he was active in the sport, but quit due to an overwhelming defeat. His life changes when a cheerful girl named Asuka Kurashina transfers to his school. There, Asuka becomes interested in Flying Circus, and despite being unfamiliar with the sport and a newcomer to the use of Grav-Shoes, she manages to score a point during a match with the Vice-Captain of a powerhouse school, which is a truly amazing feat. This leads Asuka and Masaya, together with their classmate Misaki Tobisawa, a first-year student called Mashiro Arisaka and siblings Shion and Madoka Aoyagi to form a Flying Circus team, with the goal of finding success during the Flying Circus summer tournament.