In modern-day Japan, only the direct descendants of samurais are allowed to carry swords. In the city, rumors have been spreading of Shiroyasha, a mysterious swordsman who has been attacking other swordsmen, attracting many skilled swordsmen to the city. On his way home, Ibuki witnesses a fight that involved one of his classmate, Kokonoe, who is the strongest swordsman at his school. Intrigued by his swordsmanship and skill, Ibuki intends to find out more about this mysterious student...