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( 祖母 , sobo ) ? is a villain of  . She is a high ranking human at the The Promised Neverland Grace Field House, serving as its leader, who considers Isabella as one of her pawns.
Krone told her about the escape plan of Emma, Norman, Ray, Don and Gilda, Grandma told Krone that she would leave it all in the hands of Isabella because she is important to her and above Krone in every aspect.
The Promised Neverland Manga: Chapter 21, page 1