Teriyaki Sauce: In a pot, boil water and add Japanese soy sauce until re-boiled. Add the sugar and mirin. Add the tapioca flour in small batches until thickened, whisk smooth.
Potato Bites: Preheat oil in a fryer or a deep pan to 350 degrees F. Fry tater drums according to packaging or approximately 3 minutes.
In a skillet, heat oil, add the squid and cabbage. Saute with Japanese Soy Sauce until light-brown color, place on the plate.
Place the prepared tater drums, followed by the 1/3 cup teriyaki sauce, and mayonnaise on top of squid/cabbage plating. Then sprinkle fish flakes and seaweed. Serve.