It`s been raining for days, and Ashibe-kun and Goma-chan are missing being able to play outside. Hirao sure seems to be having fun playing outside even in the rain. That gives Ashibe-kun an idea: he and his friends can just turn into frogs, too! So they all head outside in their frog raincoats, and Hirao teaches them how to have fun in the rain! Ribbit, ribbit!