Kei Ikushima is a young martial artist who currently resides in Saitama, Japan. Kei was raised by her current guardian, Shin Ikushima, after he had released her from her cryosleep chamber years ago, and has since lived a peaceful life until now, when a mysterious woman named Eileen A. told her about someone who had the answers to her missing past. Kei decided to enter the Sentoki tournament in order to meet this elusive mystery man up close.