The preservation of two important katanas, Kiriyasha and Hagasumi, is the responsibility of the Sakumiya clan. Among its members are Minagi Sakumiya and his adopted sibling, Amou. While Kiriyasha is known for its aggression, Hagasumi has the power to calm it down. After their father dies, Minagi becomes the target of mysterious individuals with various intentions, but Amou carelessly unleashes Kiriyasha's strength, resulting in the loss of their mother and his departure from the clan. Consequently, it's up to Minagi to confront his brother, aided by the Hagasumi sword, and permanently neutralize Kiriyasha's power.
