Practical Karate, known as Full Contact Karate, is a discipline where strikes and kicks determine the victor. Subaru Kannagi makes his full-contact karate tournament debut as a first-year high school student. Awaiting him are only the strongest competitors in the circuit, but at that time, no one has any idea just how powerful he truly is.

Subaru possesses an extraordinary level of natural talent that far exceeds that of his peers. As he progresses through matches, his overwhelming strength becomes increasingly apparent, yet he struggles with the emotional weight of his own ability. His victories come so easily that they often crush the dreams of opponents who have trained tirelessly. This creates a central conflict: Subaru must learn to live with the consequences of being untouchable.

The story unfolds primarily in the competitive arena of high school and national full-contact karate tournaments. Subaru is joined by teammates and rivals, including the perceptive Shintaro Shirogane, who warns Subaru to restrain his power to avoid endangering others. A key narrative arc centers on Subaru’s match against the determined Hosaki, where Subaru finally unleashes her full strength—not out of arrogance, but out of a reluctant realization that holding back is no longer an option. The aftermath forces Subaru to confront her isolation, as her talent creates an insurmountable gap between herself and everyone else.

The series explores themes of prodigy versus effort, the burden of unmatched strength, and the search for genuine competition in a world where few can stand alongside the protagonist. As the tournament continues, Subaru faces not only physical opponents but also the psychological challenge of reconciling her gift with her desire for human connection.