Chiharu Shinonome's younger, Futaba Shinonome (東雲双葉) is 5 year old sister.
She resembles Chiharu, in a character bio Seiji Matsuyama (the author) said she will one day look just like her big sister, including her breast size.
Both she and her younger brother Kazu Shinonome see Densuke as an older brother and always try to bring him and Chiharu closer together.
- Mother: Keiko Shinonome
- Other Family
- Miharu Shinonome (niece)