Primary

• Masashi Daihama Friend of Kazuki Muto
• Masashi Daihama Friend of Koji Rokumasu
• Masashi Daihama Friend of Hideyuki Okakura

Extended

• Hideyuki Okakura Friend of Kazuki Muto
• Hideyuki Okakura Friend of Masashi Daihama
• Hideyuki Okakura Friend of Koji Rokumasu
• Koji Rokumasu Friend of Kazuki Muto
• Koji Rokumasu Friend of Hideyuki Okakura
• Koji Rokumasu Friend of Masashi Daihama
• Kazuki Muto In love with Tokiko Tsumura
• Kazuki Muto Older Brother of Mahiro Muto
• Kazuki Muto Friend of Hideyuki Okakura
• Kazuki Muto Friend of Masashi Daihama
• Kazuki Muto Friend of Koji Rokumasu