Miyako Ishida

A kind and loving single mother of Shouya and his older sister who owns a hair salon. She cares for her granddaughter Maria as well as Ishida and often lets Yuzuru stay around the house. She became disappointed upon learning that Ishida bullied Nishimiya and had to pay 1.7 million yen for all the hearing aids Ishida broke.

[Spoiler] When Ishida pays her back with the intention of killing himself afterwards, she reveals that she had been aware of his plans and threatens to burn the money if he tries to kill himself again—leaving her with nothing. Unfortunately, she accidentally burns the money anyway.

After Ishida ends up in a coma, she becomes awkward around Nishimiya, despite trying to remain polite. [/Spoiler]

(Source: Wikipedia)