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As for me, I'm just happy as long as Tamamo is. We could go into what the meaning of is is, but I think here it implies an eternal source of joy.
But in order to truly feel joy, there must also be sadness in life. This fact in itself is sad, which is ..good? Since then we don't need other sad stuff to feel joy. I think? I believe I have confused myself here a little, but one thing will always remain clear - Tamamo a best!