Primary

• Shuichi Shindou Best friend of Hiroshi Nakano
• Shuichi Shindou Lover of Eiri Uesugi
• Shuichi Shindou Older Brother of Maiko Shindo

Extended

• Eiri Uesugi Younger Brother of Mika Seguchi
• Eiri Uesugi Lover of Shuichi Shindou
• Eiri Uesugi Brother-in-law of Tohma Seguchi
• Eiri Uesugi Older Brother of Tatsuha Uesugi
• Hiroshi Nakano Best friend of Shuichi Shindou
• Hiroshi Nakano Lover of Ayaka Usami
• Maiko Shindo Younger Sister of Shuichi Shindou