Not much to this, it's not even a full story. Essentially, it's just an imported hentai video arcade cabinet that you can play. That has cat-girls running around a minimalistic game world. Which you can either chase down, or temporally win over with cat nip.
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neko kai game.jpg [ 26.13 KiB | Viewed 14704 times ]
And it not unrealistic to assume that there "Nekomimi Kai" dolls on the market. And considering what kind of magazines are laying around in John's apartment...
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neko kai doll 1.jpg [ 117.45 KiB | Viewed 14704 times ]
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neko kai doll 2.jpg [ 140.35 KiB | Viewed 14704 times ]
Note: that's not real 3D model, it's just the closest I could get to making Aisha Clanclan in Street Fucker.