In her school days at the Academia, Rui was Megumi Misaki's rival and was in a relationship with Yuusuke Amamiya before breaking his heart the day she left to achieve greater heights under the guidance of Great Professor Bias. By the time she crossed paths with the Livemen, Rui had reconstructed herself as a cyborg to reflect her coldness and her desire to preserve her beauty. However, Mazenda's subconscious expresses her regret in discarding her love and kindness which manifests in her attack pattern.