Akira Satou is the older sister of Lilly Satou. She is also Lilly's guardian in Japan, due to Lilly's parents being absent. She normally dresses in a suit. She has a very tomboyish, carefree attitude, seeming to be a foil to Lilly herself. Rather irresponsible, she made Lilly do most of the cooking while they lived together, and evidently introduced her to alcohol. It is unclear whether or not her minor addiction was the spawn of Lilly's personality, or Akira's support in her drinking. In spite of her sister's bad blood with their cousin Shizune Hakamichi, Akira seems to get along well with Shizune's similarly gender-confusable younger brother, Hideaki Hakamichi. She also has a boyfriend whom she is really fond of but never makes an appearance in the game.

Akira is around 25, her voice should represent that. She also is slightly tomboyish, too.