Primary

• Aiko Iwase Former classmate of Moritaka Mashiro
• Aiko Iwase Former classmate of Akito Takagi

Extended

• Akito Takagi Friend of Moritaka Mashiro
• Akito Takagi Husband of Kaya Miyoshi
• Akito Takagi Friend of Miho Azuki
• Akito Takagi Rival of Eiji Niizuma
• Moritaka Mashiro Friend of Akito Takagi
• Moritaka Mashiro Engaged to Miho Azuki
• Moritaka Mashiro Friend of Kaya Miyoshi
• Moritaka Mashiro Rival of Eiji Niizuma