|Relatives, etc.||Unnamed Husband - (Deceased)|
|Anime debut||Episode 22|
|Manga debut||Chapter 59|
|English Voice||Vicky Baroush|
Mitsuyo is an old woman with medium length grey hair which she keeps pushed back. She has a long face and rather large chin, due to her age her face is considerably wrinkled. When at home, she is usually seen in house slippers and a long skirt and t-shirt.
She is said to have a sharp tongue, but is very kind hearted. She cared enough about Shinichi to try and stop him from leaving and getting himself killed. Due to her old job as a retailer, she can read a person fairly easy.
Mitsuyo is first seen late one night watching a Tv show about what people need to survive. After hearing a noise outside, she goes to check on it and sees an injured and exhausted Shinichi.