Junpei Murao's love affair with ballet began at a young age during his sister's ballet recital, when a male ballet dancer roused his interest with a gripping performance. But for Junpei, nothing could be worse than his peers finding out about his secret passion for ballet and perceiving him as effeminate. That is why he is in the soccer club, trains Jeet Kune Do, and is intent on following in his father's footsteps of becoming a stunt coordinator: all very "manly" activities. When Junpei's classmate Miyako Godai spots him demonstrating an impressive kick that combines skills from ballet and Jeet Kune Do to his friends, she suddenly recruits him to join her mother's ballet studio. He resists at first, and although he has abandoned his dreams of formally pursuing ballet, nothing quite captures the euphoria that ballet elicits. After suppressing his desire to pursue ballet for so long, it is not so easy to shake off his hesitation and break free of the shackles of masculinity. Junpei has to be willing to make certain sacrifices and fully commit to ballet, all while risking losing some friends.

At the Ministry of Science, fervent Professor Ochanomizu alongside his coworkers strive to reactivate Atom—the first robot with a human heart. Atom is the masterpiece of enigmatic Professor Umatarou Tenma, who built the android to replace his deceased son Tobio. However, while Tenma inexplicably shut down his brainchild and disappeared, Ochanomizu refuses to let such a major breakthrough in science go to waste. Despite having the appearance of a nine-year-old, Atom not only possesses incredible strength and intelligence, but he is also endowed with a remarkable conscience and compassion that rivals humans. Sadly, the mechanical boy soon faces rejection and learns that not everyone is as welcoming as Ochanomizu. Although automatons have integrated into society, they are accepted only as tools and even seen as an upcoming threat to mankind's dominion. Dreaming of a world where people and robots can prosper together, Atom dedicates his existence to protecting the lives of both and inspiring them to form genuine bonds.