Following the disappearance of his beloved grandfather—an acclaimed martial artist—Neruma "Neru" Isami is left with only illustrated teachings to guide his training. Despite growing up in a society where hand-to-hand combat is deemed unnecessary, Neru gradually becomes a fierce martial arts prodigy. Now a junior high school student, Neru frequently requests sparring matches with his peers, but he cannot seem to fit in or find his true purpose. However, Neru is thrust into a whole new world when Akebi Haiba, an upperclassman, invites him to join a martial arts academy for young talents. At Amato High School, Neru is pushed to his limits through relentless training, receiving praise and admiration in the process. In light of his newfound notoriety, Neru must hold onto his grandfather's wisdom or risk losing sight of what is important. [Written by MAL Rewrite]