Primary

• Akira Nikaidou Friend of Tsukina Sasagiri
• Akira Nikaidou Friend of Yuuya Nonomura
• Akira Nikaidou Friend of Toru Souma

Extended

• Tsukina Sasagiri Step-sister of Toru Souma
• Tsukina Sasagiri Friend of Yuuya Nonomura
• Tsukina Sasagiri Friend of Akira Nikaidou
• Toru Souma Step-brother of Ren Mizusaka
• Toru Souma Step-brother of Tsukina Sasagiri
• Toru Souma Friend of Akira Nikaidou
• Toru Souma Friend of Yuuya Nonomura
• Toru Souma Enemy of Ayane Shidou
• Yuuya Nonomura Friend of Akira Nikaidou
• Yuuya Nonomura Friend of Tsukina Sasagiri
• Yuuya Nonomura Friend of Toru Souma