Yeah, It's Summer (E68)

Watching cumulonimbus clouds, Bonobono thinks to himself, "Yeah, it's summer." He gets excited and starts running around. He wonders what others do when they think, "Yeah, it's summer." Walking where Prairie Dog points him, Bonobono finds a sign for a Summer-Seller with a pinwheel turning. Bonobono enters the Summer-Seller shop, as it is beckoning to him. (Crunchyroll)