Miyako Tachibana serves as a supporting character and is the fraternal older twin sister of Sōichirō Tachibana, who plays forward for Tokyo City Esperion FC's B Team. She possesses a slim, fit physique of average height, with short black hair and tanned skin. Her typical serious expression contrasts sharply with her twin brother's frequent relaxed smile. Miyako exhibits a strong, dynamic, and masculine personality, differing from Sōichirō's lighter disposition. She is associated with Tokyo Musashino, the football organization her brother belonged to prior to joining Esperion.