Kayuan is a cafe inside Mitsukoshi in Sapporo that sells sweets from across Japan by the piece, like a small antenna shop. Customers pick popular sweets from different regions. The sweet potato yokan from Funawa in Tokyo arrives on Tuesdays and Saturdays, and the nama yatsuhashi from Kyoto is available only on Mondays and Fridays. Popular items can sell out the next day, so the sweets you want are easy to miss.