The bustling metropolis of Kansai, where cybernetic screens litter the neon landscape, may seem like a technological utopia at first glance. But in the dark alleys around the brightly-lit buildings, an unforgiving criminal underbelly still exists in the form of fugitives known as Akudama. No stranger to these individuals, Kansai police begin the countdown to the public execution of an infamous Akudama Cutthroat, guilty of killing 999 people. However, a mysterious message is sent to several elite Akudama, enlisting them to free Cutthroat for a substantial amount of money. An invisible hand seeks to gather these dangerous personas in one place, ensuring that the execution is well underway to becoming a full-blown bloodbath.

With the invention of anti-gravitational shoes known as Grav-Shoes, the ability to fly freely has become an everyday experience for the people inhabiting a four-island archipelago south of Japan. This invention has brought the people new ways of living and also a new sport known as Flying Circus, where participants gain points by either touching floating buoys or their opponent's back. The gullible and clumsy Asuka Kurashina, newly transferred to Kunahama High School, enters this world of flight unknowingly when she is able to pull off a difficult maneuver the first time she participates in a Flying Circus match. Eventually, this leads her to join her school’s Flying Circus club. Led by their coach, Masaya Hinata, their members consist of the experienced Misaki Tobisawa and her overprotective friend, Mashiro Arisaka. Ao no Kanata no Four Rhythm follows this rookie group soaring high above the skies and toward their dreams, armed only with their unwavering passion against an uncertain future.

Continuing on his quest to retake Ecbatana, Prince Arslan and his company march toward the city. But upon receiving news that the neighboring Kingdom of Turan is launching an assault on the Parsian stronghold at Peshawar Citadel, the prince is forced to turn back in order to defend the fortress. Amid holding off the invading forces, the Parsian army is met by an unexpected visitor. As Arslan returns to Peshawar, Prince Hermes takes a slight detour from his clash against his cousin to search for the legendary sword Rukhnabad, which would grant him the right to rule and take back what he believes is rightfully his. However, after unearthing the lost artifact, the blade is stolen by the Temple Knights of Lusitania, prompting the masked warrior to give chase. Meanwhile in Ecbatana, the captive King Andragoras III finds an opportunity to strike and begins to make his move. As the separate sides of the Parsian royal conflict clash, Arslan's right to the throne falls under attack. But no matter the obstacles in their way, the young prince and his loyal band of warriors charge forward to restore Pars to its former glory.

The year is 320. Under the rule of the belligerent King Andragoras III, the Kingdom of Pars is at war with the neighboring empire, Lusitania. Though different from his father in many aspects, Arslan, the young prince, sets out to prove his valor on the battlefield for the very first time. However, when the king is betrayed by one of his most trusted officials, the Parsian army is decimated and the capital city of Ecbatana is sieged. With the army in shambles and the Lusitanians out for his head, Arslan is forced to go on the run. With a respected general by his side, Daryun, Arslan soon sets off on a journey in search of allies that will help him take back his home. However, the enemies that the prince faces are far from limited to just those occupying his kingdom. Armies of other kingdoms stand ready to conquer Ecbatana. Moreover, the mastermind behind Lusitania's victory, an enigmatic man hiding behind a silver mask, poses a dangerous threat to Arslan and his company as he possesses a secret that could jeopardize Arslan's right to succession. With the odds stacked against him, Arslan must find the strength and courage to overcome these obstacles, and allies who will help him fight in the journey that will help prepare him for the day he becomes king.