The alternative world in Aokana - Four Rhythms Across the Blue has a large number of advanced technologies that help people to exist peacefully. Thanks to gravity shoes, residents can float in the air. People move quickly, organizing sports competitions that can diversify the lives of local residents. In a Japanese city, there is a closed and shy student of the Kunahama Institute named Masaya Hinata. He is eager to develop his talents. Kurashina Asuka, who is not only a classmate but also a good friend, will help the virtual protégé in this. They learn to use unusual shoes together. Mentors help them with this. There is an opportunity to meet Tobisawa Misaki, who likes animals, including cats. Professionally engaged in an unusual sport. Arisaka Mashiro is the daughter of wealthy parents who own a popular restaurant. Ichinose Rika loves football, as well as a delicious lunch. In Aokana - Four Rhythms Across the Blue, you can make certain decisions that will affect the situations and the ending as a whole. You can study the characteristics of each heroine by having affairs. In addition to the main girls, there are such characters:
- Satoin Reiko - the family owns the restaurant business Satou Food Group, whose cuisine is based on seafood.
- Inui Saki - spent a long time in England, doing sports training.
- Kagami Aoi - a physical education teacher at a football club.
- Aoyagi Shion - quite hot-tempered.
- Madoka - is the younger sister of the previous participant.
- Minori Hosaka - likes to comment on events.
- Shirase Hayato - a clothing seller.
- Minamo - blood sister.