Masako Yamada (山田 雅子 Yamada Masako) was the mother of Yumeria Moegi/AkibaYellow. She was a famous cosplayer named Miyabi (ミヤビ Miyabi), with her daughter following in her footsteps. Despite her tragic death in a car accident five years before her daughter joined the Akibarangers, she returned on Yumeria's 24th birthday via a delusion created by the latter's strong thoughts for her mother on her birthdays. This manifestation of Masako aided the Akibarangers in their fight against ©Na and a revived Kabukichōmesugurohyoumonchou, and temporarily became AkibaYellow (アキバイエロー Akiba Ierō) in place of her daughter to defeat the monster.