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Throughout the novel, it is implied that she has short hair.
Satomi is a childhood friend of Ikuya Kirishima who was also a part of the Iwatobi Junior High School Swim Club. She and Haruka are the class library assistants as first years at Iwatobi Junior High School.
- She, Ikuya, and Natsuya Kirishima have a picture where they're in a bathtub together, as children. Having been heavily reliant on her and Natsuya in the past, Ikuya decides to bury the picture as a way to move on.
- Satomi is talkative in class.
- Satomi often calls Ikuya an idiot, in a fond way.