Masaki Amamiya is the grandfather of Sonomi/Samantha and Nadeshiko/Natasha. Therefore, he is Sakura, Touya/Tori and Tomoyo/Madison's great-grandfather. He lives alone in his mansion in the country. His greatest joy was Nadeshiko/Natasha and her painting of the rainbow. Sakura, however, has become his favorite great-granddaughter due to her kindness and giving him a rainbow (Volume 5, Chapter 1). He still gives her dresses time to time.