都 瑠璃子

She is a member of the branch family, who arrives to protect the Keigen Shishin-ryu style successor as a companion. She is very loyal to her future husband, the protagonist and always tries to be by his side.

She was raised for the sake of the main family, and was taught that "winning is natural, success is natural" and her strength is the result of accumulated effort. She has the tendency to abandon everything except the main family and the protagonist.

She does not involve herself with others unless it is a necessity, and is strict with herself and ruthless with others. She doesn't see this as a problem, since the protagonist is all she needs in her life.