Yayoi is a bright and cheerful girl who cares for her family very much. Due to her father's unstable occupational status her family is quite poor, as indicated Yayoi's plain clothing, which she had for a very long time. To earn extra money, Yayoi often does cleaning and other odd jobs around 765 Production Building, and continues to do so even after she debuts as an idol. She is endlessly energetic, however, and never the weight of the world to discourage her. Yayoi is the oldest of six siblings and always has to be the one who looks after them, but also wishes she had an "older brother" type around to look after her.