Special
This cow temple is special. This cow must have been very important to have an entire temple dedicated to it.
Picture a temple dedicated to a single cow. All of the people who come and worship here have a special place in their hearts for the cow.
とく
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This cow is special because it belonged to Tokugawa (とく) Ieyasu, the first shōgun of the Tokugawa shogunate and uniter of Japan! He's a super important figure in Japanese history. You should absolutely look him up and read a bit about him (when you're caught up on these lessons, that is).
You walk up to a statue of the special cow in the temple and see a collar around its neck that says "Tokugawa Moo Moo" on it. How... special!