Primary

• Mariko Sakai Daughter of Mariko Sakai
• Mariko Sakai Half-sister of Sana Kurata

Extended

• Sana Kurata Lover of Akito Hayama
• Sana Kurata Friend of Aya Sugita
• Sana Kurata Friend of Fuuka Matsui
• Sana Kurata Friend of Hisae Kamayai
• Sana Kurata Friend of Mami Suzuki
• Sana Kurata Former girlfriend of Naozumi Kamura
• Sana Kurata managed by Rei Sagami
• Sana Kurata Friend of Tsuyoshi Ohki
• Sana Kurata Daughter of Misako Kurata
• Sana Kurata Biological Daughter of Keiko Sakai
• Sana Kurata Half-sister of Mariko Sakai
• Sana Kurata Biological Daughter of Takeshi Gojo
• Mariko Sakai Daughter of Mariko Sakai
• Mariko Sakai Half-sister of Sana Kurata