Abundant, Wealthy
In spirit valley, spirits are abundant. Hence the name. Spirit valley has over two billion spirits floating in it.
Just picture those forest spirits from that famous anime film. The woods are full of them. An abundant valley of spirits.
ゆう
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In spirit valley, it's not just spirits that are abundant. There is an abundance of youths (ゆう) as well.
Imagine an abundant number of spirits and youths hanging out, drinking microbrews and eating avocado toast. Spirit Valley is a weird place.