Tatsumi is the eldest sibling of Torakichi and Kanoemon and wife of Souma, a doctor. She took responsibility of taking care of Shirou since Torakichi left Shirou at two years old. She is strict to the extent of being called "General Mom" by her daughter Sanako. She also has a son named Kouta.

Albeit strict, she worries and cares a lot for her brothers. Since she had taken Shirou under her care while Tora was away, she looks out for Shirou's happiness. Consequently, she expects a lot out of Torakichi and is seemingly always prepared to take Shirou back under her care.

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