Kayaba is a soba restaurant on the 8th floor of Takashimaya in Nihonbashi, Tokyo, serving soba and sushi together. It offers Kaya Hachisoba, seiro, and tempura soba, and also runs a sushi counter. Soba and sushi can be ordered together in one hall, and the Kaya Hachisoba goes down lightly. At lunch a line forms and entry can take about 30 minutes.