As the daughter of the president of apparel brand "OTO," Aiko was born and raised in a luxurious mansion. Surrounded by numerous servants, among them was Ozawa, who had cared for her the longest. Spoiled since childhood, Aiko was especially unkind toward Ozawa—arrogant and demanding, constantly tormenting her with selfish behavior. Unable to fight back, Ozawa had endured endless mistreatment from this bratty young girl for years, until finally reaching her breaking point.