Is this really made by kupala? The art style differs from what he/she usually uses and it looks more like something of DigDug's art style.
kupala credits DigDug as a guest in the introduction page of the doujin, though it doesn't specifically mention what he did. I think you're right though.
kupala credits DigDug as a guest in the introduction page of the doujin, though it doesn't specifically mention what he did. I think you're right though.
There's a sequel made too, along with a second Exhibition Match (Kanako vs Yukari) although I've yet to see either beyond the preview pages.