Geparuto Giboshi (擬宝珠夏春都) is Ryo-san's grand-aunt (the younger sister of Kanbei, Ryotsu's grandfather) and Matoi's grandmother. She is the hostess of Chō Kanda Sushi. She is a stubborn and obstinate woman with a frightening memory, but she is very warm by nature. Since Ryo-san taught her how to use a computer, she has begun using all sorts of high tech gadgets. She disapproves of Ryo-san and is always trying to keep her granddaughters Matoi and Lemon from falling in love with him, especially Matoi. She is over 100 years old but still perfectly healthy – one of the very few characters who consistently gets the best of Ryo-san.