Primary

• Akiho Kousaka Daughter of Natsuo Kousaka
• Akiho Kousaka Daughter of Fuyumi Kousaka
• Akiho Kousaka Girlfriend of Haruka Shinozaki

Extended

• Haruka Shinozaki Boyfriend of Akiho Kousaka
• Haruka Shinozaki Older Brother of Kanata Shinozaki
• Haruka Shinozaki Childhood friend of Shizuku Ariyama
• Fuyumi Kousaka Mother of Akiho Kousaka
• Fuyumi Kousaka Wife of Natsuo Kousaka
• Natsuo Kousaka Husband of Fuyumi Kousaka
• Natsuo Kousaka Father of Akiho Kousaka