She has black-colored hair and is mostly seen wearing a cap either in the shop and outdoor.
Revival manager label the Komugiya shop as a shitty bread shop. 
During summer of their third years, both Fuutarou and Nino Nakano receive a call from the manager, annoucing to that the pastry shop will be closed temporarily as he was hospitalized. It was revealed that he was involved in a motorcycle accident. Accompanying him at the hospital is the owner of the Komugiya, who is assumed to have caused the accident. ("Coincidence-Free Summer Break").
"This is weird...she followed the recipe exactly as it's written,but by some mysterious force, it turned into a failure..." (Referring to Miku's bread)