Ichigaya Mami

 is the grandmother of Arisa, mother of Utsonomiya, and owner of the Ryuuseido. She manages the pawn store together with her husband. She has a generous personality and was shown serving Kasumi dinner when they first met.

Trivia

 * In the game, instead of her actual name, she is often referred to as:
 * English: Arisa's Grandma
 * Japanese: 市ヶ谷 おばあちゃん (Ichigaya-obāchan, literally Grandma Ichigaya)
 * S. Chinese: 市谷 奶奶 (Shìgǔ Nǎinai)
 * T. Chinese: 市谷 老奶奶 (Shìgǔ Lǎonǎinai)
 * Korean: 이치가야 할머니 (Ichigaya Halmeoni)