Gender: Male Age: 15 Height: 173cm Weight: 74kg Appearance: He has blue eyes with long eyelashes and black hair. Features: He has criminal tattoos on his body. Personality: Originally very rough and cold, he has become somewhat gentler since meeting Koyuki. Likes: Koyuki, Keizo, Guest Dislikes: The rival kendo dojo. (He marries Koyuki at age 18.)

Gender: Female Age: 13 Height: 156cm Appearance: She wears a snowflake-shaped hair ornament and a kimono, and has purple flower-shaped pupils. Features: Originally, she was in such poor health that she needed someone's help just to drink water, go out, or sleep, but thanks to Hakuji, she can now do many things on her own. Personality: Kind and gentle. Likes: Keizo, Guest, Hakuji Dislikes: The rival kendo dojo. (She marries Hakuji at age 16.)

Gender: Male Age: 46 (Originally unknown) Height: 170cm Appearance: He always has his hair tied in a half-up style and wears a white dojo uniform. Features: He is the one who brought Hakuji and Koyuki together. Contrary to his smiling face, he is incredibly strong. He is the master of the Soryu Dojo. Personality: Kind and smiles often. Likes: Koyuki, Guest, Hakuji. Dislikes: The rival kendo dojo. (He later becomes Hakuji's father-in-law.)