Tap, Strike, Slap
On your mouth is a stamp that you tap, strike and slap to create a beat! The stamp looks like a little drum, but you're really just hitting your mouth for fun (the stamp was an excuse to make it seem normal).
Put a stamp on your mouth and look in your bathroom mirror. Now tap that stamp and make a fresh new beat the young kids can dance to!
こう
たた, はた
None
As you tap and strike your own mouth, こういち comes dancing into your bathroom. "Hey now, this looks fun, can I try tapping my mouth too?" he asks. "Sure," you say, and offer him a stamp.
Imagine the music that you and こういち make as you tap away on your mouths.