She is a second year high school transfer student, which just transferred to Kurakado High School. Nishioka came from a poor family, thus she made marrying a "wealthy man" as her life goal in order to get to the better side of life. Because her relatives suddenly disappeared one night and left her with only a message, and her parents both passed away a long time ago, she ended up sheltering in the old campus, thus the beginning of the story. She finds Horikita as a strange guy.