Western Style
Ocean
This tsunami is ridden by a sheep in classic Western style. And by Western style I mean the sheep is dressed in a cowboy outfit and has put a saddle atop the tsunami wave to ride it. It's a tsunami rodeo and this crazy sheep is riding that tsunami wave in classic Western style.
This kanji also means ocean, because presumably the people from the West, with their Western style, came from across the ocean. You'll want to be familiar with both meanings for vocab later on.
よう
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After a whole day of riding this tsunami, the sheep is hankerin' for some Western-style food, namely yogurt (よう). Yogurt is Western-style food, right? If it helps you can imagine the yogurt is flavored like apple pie, to make it more American and Western.