Primary

• Four Older Brother of Three
• Four Younger Brother of V
• Four Former enemy of Ryouga Kamishiro

Extended

• Ryouga Kamishiro Friend of Kite Tenjo
• Ryouga Kamishiro Friend of Yuma Tsukumo
• Ryouga Kamishiro Older Brother of Rio Kamishiro
• Ryouga Kamishiro Former enemy of Four
• Three Younger Brother of Four
• Three Younger Brother of V
• Three Friend of Yuma Tsukumo
• V Older Brother of Four
• V Older Brother of Three
• V Former mentor of Kite Tenjo