Robatato Kaisen Matsui is a seafood izakaya in Osaka, a three-minute walk from Higashi-Umeda Station in Umeda. It serves robatayaki and sashimi, including aged hoe wrapped in seaweed without rice and salt-grilled prawns finished over charcoal. The first drink is ordered verbally, and after that orders are placed by scanning a QR code on a smartphone. The counter looks onto the robata grill, and the seats are nearly full even on weekday evenings.