Every time you open and close the smartphone case, the sumo wrestlers clash with each other with "Hakkeyoi, Nokotta!" On the back of the case, there is a referee wearing the costume of Shonosuke Kimura, the highest rank referee, and you can reproduce a series of scenes of the match. A luxurious smartphone case that allows you to enjoy sumo wrestling at your fingertips at any time, even when there is no main place.