Ishiusubiki Nihachi Soba Ishiraku Nijubashi Building is a soba restaurant inside the Nijubashi Building in Tokyo that serves stone-ground nihachi soba and rice bowls. A set combining a shrimp tempura rice bowl with house-made nihachi soba appears to be the main lunch item. On weekdays at lunch it runs a limited menu, and a line forms after noon. The soba noodles are smooth, with flavor and texture intact.