After being included for a special battle in Yokai Watch 2, Don-chan is back in the Level-5 RPG world of Yokai Watch 3 Sushi/Tempura for more battles with your new Yokai pals! Without getting into the specific Yokai Watch mechanics here, the battles appears to be available once daily. This reflects back to 3DS3 once again featuring Yokai Watch collaboration elements, similar to the 3DS2/YW2 tie-in.
After the battles, why not relax yourself with a minigame featuring a spinning disk-thing catching notes under the rhythms of Fuunshishi (using actual Kantan and Muzukashii charts)? (Wonder why Fuunshishi is getting so much attention lately though.)