"Kick no Oni" is a supernatural action anime centered around a young boy named Tatsuya, who discovers he possesses a unique ability to exorcise demons, or "oni," by physically kicking them. The story begins in a quiet rural town where Tatsuya lives a seemingly ordinary life until he encounters a mysterious oni that attacks his family. This event awakens his latent power, and he learns that his kicks can banish these malevolent spirits. As Tatsuya grapples with his newfound ability, he is approached by a secretive organization known as the Oni Exorcist Association, which recruits individuals with similar powers to combat the growing threat of oni infestations.

The narrative follows Tatsuya as he joins the association and trains under seasoned exorcists, including the stoic and experienced mentor, Haruka, and the fiery and determined exorcist, Rina. Together, they investigate various cases of oni disturbances, each tied to unresolved human emotions or tragic events that give rise to these spirits. The series explores the origins of oni, revealing that they are manifestations of negative human emotions such as anger, grief, and jealousy. As Tatsuya grows stronger, he uncovers a deeper conspiracy within the association, involving rogue exorcists who seek to exploit oni for their own gain.

Key characters include Tatsuya, whose determination and compassion drive the story; Haruka, whose tragic past fuels her relentless pursuit of justice; and Rina, whose impulsive nature often clashes with Tatsuya’s more cautious approach. The antagonist, a rogue exorcist named Kuro, serves as a foil to Tatsuya, embodying the dangers of unchecked power and ambition. The series balances episodic oni-exorcism missions with an overarching plot that delves into themes of redemption, the consequences of human emotions, and the moral complexities of wielding supernatural abilities.

The story builds toward a climactic confrontation between Tatsuya and Kuro, culminating in a battle that tests Tatsuya’s resolve and forces him to confront the darker aspects of his own power. The resolution ties together the personal growth of the characters and the broader implications of their fight against the oni, leaving room for potential future developments in the world of exorcists and spirits.