Primary

• Hibiki Kugenin Friend of Kenichi Shirahama

Extended

• Kenichi Shirahama In love with Miu Fuurinji
• Kenichi Shirahama brother of Honoka Shirahama
• Kenichi Shirahama son of Mototsugu Shirahama
• Kenichi Shirahama son of Saori Shirahama
• Kenichi Shirahama disciple of Hayato Fuurinji
• Kenichi Shirahama disciple of Kensei Ma
• Kenichi Shirahama disciple of Shio Sakaki
• Kenichi Shirahama disciple of Akisame Kouetsuji
• Kenichi Shirahama disciple of Shigure Kousaka
• Kenichi Shirahama disciple of Apachai Hopachai
• Kenichi Shirahama Friend of Natsu Tanimoto
• Kenichi Shirahama Friend of Renka Ma
• Kenichi Shirahama Friend of Yuuka Izumi
• Kenichi Shirahama Friend of Mizunuma
• Kenichi Shirahama Friend of Hibiki Kugenin
• Kenichi Shirahama Friend of Kamioka
• Kenichi Shirahama Friend of Yuuma Chiaki
• Kenichi Shirahama Friend of Touchuumaru
• Kenichi Shirahama Friend of Matsui
• Kenichi Shirahama Friend of Kouzou Ukita
• Kenichi Shirahama Friend of Kaname Kugatachi
• Kenichi Shirahama Friend of Ikki Takeda
• Kenichi Shirahama Friend of Haruo Niijima
• Kenichi Shirahama Student of Kyouko Ono
• Kenichi Shirahama Rival of Ryuuto Asamiya