Kyou Matsuoka

Kyou Matsuoka is the grandmother of Rin Matsuoka and Gou Matsuoka. She is also the mother of Toraichi Matsuoka, Rin and Gou's father. When Rin transfers shools from Sano Elementary School to Iwatobi Elementary School, he lives with his grandmother. She goes and watches Haruka Nanase's first swim tournament in junior high school in place of Rin. She is also the last ama in Iwatobi Town.