Mayumi Matsushita

Name: Mayumi Matsushita
Sex: Female
Age: 54
Birthday: August 31
Profession: Part-time Worker.
Likes: Floral patterns, Ota, Takero.
Dislikes: Witches, Everything that witch does.
Hobbies: Cleaning the Shop, Making Soy Sauce.
Skills: Everyday Cuisines, Obscure Puns.

Mayumi is Ota's mother. Over 30 years ago, she and her husband took out significant loans to open Matsushita Diner near the Kabasaki District. She has been running the diner ever since. Lately, her memory has begun to get spotty.

From the in-game character description

Mayumi has dementia which causes the memory loss of the shutdown of the Diner and her husband's death.