Ryouichi, a boy who is called "Wild child" because of his violent nature and is feared by the people around him. One day, he is taken in by a police officer named Komiya. In order to rehabilitate Ryoichi, Komiya decided to use "kendo" as a means of rehabilitation. This encounter led the boy to begin the profound path of swordsmanship, but a betrayal by his friends left him severely wounded and with a permanent scar on his right arm. Ryouichi, a one-armed swordsman who is determined to master the upper tier, creates a sensation in the world of kendo.