The brilliant 21 year old scientist, Diane Frost, daughter of the rich Mike and Carla Frost and older sister figure for the lead character Shikiro Rainn, is the new inheritor of Capsule Corporation. Although Diane possesses a practically superhuman level intellect, she holds quite the temper that is often unleashed against those who even dare show her the slightest bit of disrespect. Despite her temperament, Diane often portrays friendliness and helpfulness towards others. She approaches major situations logically, often the one making the crucial decisions.