Formal Name Ender, Manner
By a tree, there's a sheep in the water with a formal name ender. That means everyone calls him Sheep-sama. No one calls him just "Sheep," since he's kind of a big deal. He's actually like sheep royalty. When he's not in his castle, Sheep-sama enjoys playing in the water by the trees. This can also mean manner, as in your manner of doing things. I guess someone with a formal name ender has a different manner of doing things.
Imagine what Sheep-sama must have done to become such important and distinguished sheep royalty. Some pretty amazing things, probably, especially for a sheep.
よう
さま
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This sheep with the formal name ender only likes to play outside in the water during the summer (さま). Summer is the best season for this fancy sheep. The other seasons just can't compare.
Imagine playing in the water with Sheep-sama in the summer. It's crazy hot outside in the summer, so going in the water feels nice. Imagine the coolness of the refreshing water envelop your body.