Primary

• Bunshichi Tawara Best friend of Shin Natsume
• Bunshichi Tawara Best friend of Mitsuomi Takayanagi

Extended

• Shin Natsume Older Brother of Maya Natsume
• Shin Natsume Older Brother of Aya Natsume
• Shin Natsume Best friend of Bunshichi Tawara
• Mitsuomi Takayanagi Older Brother of Masataka Takayanagi
• Mitsuomi Takayanagi In love with Maya Natsume
• Mitsuomi Takayanagi Son of Dougen Takayanagi
• Mitsuomi Takayanagi Best friend of Bunshichi Tawara