Primary

• Ren Tachibana younger brother of Makoto Tachibana
• Ren Tachibana Twin Brother of Ran Tachibana

Extended

• Makoto Tachibana Older Brother of Ran Tachibana
• Makoto Tachibana Older Brother of Ren Tachibana
• Makoto Tachibana Friend of Haruka Nanase
• Makoto Tachibana Teammate of Nagisa Hazuki
• Makoto Tachibana Teammate of Rei Ryugazaki
• Ran Tachibana Younger Sister of Makoto Tachibana
• Ran Tachibana Twin Sister of Ren Tachibana