I was so happy that I nearly guessed the trick! I seldom guessed it before. ( Ok, I accept I have a low IQ. )

This episode is about Kid’s telesport. I noticed the rool srceen at the scene above. I have a simple belief — the more detail, the more cost. Nothing is waste in every scene of anime. Drawing a roll srccen is more troublesome than a vertically hung scroll. I wondered why they drawed this scene…

At the time the trick was divulged, I was so proud of my discernment >v<. The roll screen is the core of the trick. It is not waste to draw. It proved that my belief was quite proper.