I just checked for said game on a share site I browse pretty regularly. Sometimes you can find region-locked games there as they probably use a VPN to get around DLSite's region blocking, or perhaps they get their stuff from other sites? Not sure how they go about "procuring" the games they share.
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Edit: Eh, gonna take out the direct link because that looks like loli. Not sure if it counts as sharing by making a direct link since it's not a DLSite link (even though that rule is now kinda moot because DLSite is now region-blocking loli content). But you can go to the site and search on the RJ number in and find it that way.