Primary

• Akira Tsubaki Younger Brother of Youko Tsubaki
• Akira Tsubaki Friend of Kouhei Ueno
• Akira Tsubaki Boyfriend of Mikoto Urabe

Extended

• Mikoto Urabe Friend of Ayuko Oka
• Mikoto Urabe Girlfriend of Akira Tsubaki
• Kouhei Ueno Boyfriend of Ayuko Oka
• Youko Tsubaki Older sister of Akira Tsubaki