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Satomi resembles her daughter with long curly auburn hair worn in a low ponytail. She has red eyes. Normally she wears a mauve top with denim pants and a pair of lavender and white sneakers. Over this is a white labcoat with a stethoscope around her neck.
A bighearted lady, Satomi travels to small villages all over the world as a doctor. Also as a loving mother, she often makes sweets with Ichika as a means to give her the most love as possible during their limited time together.
- Usami Ichika - Her daughter. Ichika sees her mother as a heroine who travels the world to help people. Satomi regularly sends her letters and packages with handmade sweets. She sometimes regrets not being there for Ichika, but Ichika assured her that she's okay.
- Usami Genichirou - Her husband.