I have listed this sketch as coming from an unknown episode. I am pretty sure it comes from episode twenty-two. There is a scene that matches fairly closely to this sketch. Ginko is smoking and there are mountains in the background. It also came with a few other sketches that I know are from episode twenty-two. The only thing making me unsure is the camera angle on Ginko. In the show he is shown in profile instead of 3/4 like in this image. Maybe they decided to change his position sometime after this sketch was drawn.