With thanks to Cate Newton of phlebotomist.net for passing it on, here is her handy infographic on the practice of blood typing, which notes the wide variety of blood type-themed products in Japan despite there being no scientific validity to the practice whatsoever.
Known as hyeolaek-hyeong in Korean (혈액형), the practice is also popular here, and definitely a common theme in advertising (such as for kiwifruit and soft drinks). But there are far less actual products available though, and certainly not condoms.
Perhaps because people would be confused? After all, is the required condom type determined by the blood-type of the wearer, or of his partner?
Putting aside the fact that the question itself reveals how completely inane the product is, then I’m guessing the former. Otherwise, some pretty big wallets would be required when heading out for a night on the town…
Any Japan-based readers that can confirm that though, then do please fill me in!^^
Update: See here for a blood-type condom vending machine in Japan.