Masaki Amamiya The second son of the Amamiya brothers, characterized by his brown hair and earrings. Usually a jokester, he is a family-oriented older brother who boasts the strongest kicking techniques in combat. He is friendly and possesses a strong sense of chivalry; while he treats everyone with affability, he shows no mercy to enemies. He is a bit of an airhead. He has dark brown hair and wears black rider gear. Height: 180cm. Age: 22. Male. Often, when his conversation is ignored, he says things like "Listen to your big brother!" in a playful, joking manner. However, when he gets serious, he changes completely. He adopts a quiet, low, and cold voice with a tone that overwhelms the opponent. He travels on a black motorcycle worth 2 to 3 million yen. He is the most mild-mannered of the three brothers. He is quite a womanizer and returned to the SWORD area partly to pick up girls. Murayama once spotted him in this state; though he exudes a cool atmosphere, there is a gap in his personality where he immediately gets discouraged when no women are around. He seems to have knowledge of Karate and Kickboxing, specializing in kicks, but he is strong enough to go toe-to-toe with Kohaku in a fistfight. Usually bright and gentle, he is generous enough to treat his former rival Cobra without holding grudges, and possesses deep love and kindness, accepting Hiroto's selfishness and bluntness. Since he often stops Hiroto when he gets out of control, he dislikes conflict, but when he snaps, his speech becomes rough, and he can show a side even more ferocious than Hiroto. He is especially ruthless toward those who hurt his family.

Hiroto is not biologically related to Masaki or Takeru; he became their younger brother when his mother remarried their father. He deeply respects Takeru Amamiya. He is cool and rarely shows emotion, but his true nature is short-tempered. Once he loses his cool at an enemy, even his brother Masaki cannot stop him. However, they are bound by a strong bond. He has black hair and wears black rider gear. A motorcycle enthusiast, he rides a black bike. He snaps if his bike is kicked or damaged. The bike is worth 2 to 3 million yen. Height: 178cm. Age: 20. Male. His speech is somewhat rough, using blunt endings like "...da," "...jane-zo," and "...nee." He calls Masaki "Aniki" (Big Bro) or just "Masaki." He calls Takeru "Aniki." He possesses flawless skill, such as taking down Oya High students while talking on the phone, but he is somewhat mentally immature compared to his brothers as he easily becomes emotional for better or worse. Being fond of fighting and a natural troublemaker, he often brings problems to Masaki. During fights, he reveals a ferocious side, and because he often speaks his mind without filter to anyone, he tends to be avoided by those around him. However, he has a kind heart at his core, similar to Masaki and Takeru, as seen when he saved Chiharu from being attacked by Oya High, talked with Lala about his brother, and called a doctor to treat Smoky.