Muteki Kareshi Ayumi became the manager of Oumi High School’s kendo club. The powerful team has fallen, and the continuing of the club is in dispute. Ayumi tries to make the invincible swordsman, Mutou Hajime join the club to settle it, but all he says is: “Who are you?” “So troublesome.” “Don’t look down on kendo.” etc. His attitude is also invincible and Ayumi falls in love with this problematic man?