Kureha is a female adult with brown hair cut to neck length and blue eyes. She is the younger sister of Shien, a ninja infiltrating an underground fighting organization for the police. This organization kidnapped Kureha, using her captivity as leverage to force Shien to compete in their tournaments under the promise that winning would secure Kureha's release.

During her imprisonment, Kureha endured traumatic experiences, including being forced to watch her sister face challenges and being raped by two androids. Despite Shien's participation, the organization subjected Kureha to brainwashing before the tournament concluded, rendering Shien's potential victory meaningless for her freedom. Following her subjugation, Kureha underwent a face heel turn and ultimately served the organization that imprisoned her.