Masato's mother. She at first blames her daughter-in-law for making Hikaru autistic, but later finds out the truth and forgives her and her family. While she does not blame Sachiko for Hikaru's autism anymore, she still has not completely warmed up to him. She is very devoted to Kanon, to the point of ignoring Hikaru. In tankōbon three, she berades Sachiko for putting Kanon in daycare and letting her act "crude." She presses her son and daughter-in-law to send Kanon to the same school as her other granddaughter, going so far as to offer to let Kanon, but only Kanon, live with her to cut down on the commute. Masato rebuffs her offer. She tends to alternate between a kimono and Western clothing.

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