Primary

• Mahiro Muto Sister of Kazuki Muto

Extended

• 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