This appears to be the Mizunomori Water Botanical Garden. A very similar photo to yours can be seen here. It is apparently located at 1091 Oroshimo-cho, Kusatsu City, Shiga.
(Note that your Google Maps link is not pointing to the city of Kusatsu in Shiga Prefecture, but to a different and much smaller town named Kusatsu in Gunma Prefecture.)
Credit:stackoverflow.com‘
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