In the West we've grown accustomed to the fact that Japan seems to be a mix of high-tech, tradition and bat-shit crazy nonsense. Today's story is very much the latter.
Back in 1900, Austrian biologist Karl Landsteiner discovered blood types. A whole bunch of researchers got excited about this and one of the first things they did was compare the distribution of blood types in different countries. It was found, for instance, that there was a higher incidence of the B blood type in Asia.
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Everyone forgot about the blood/personality thing until the 1970s when a lawyer named Masahiko Nomi who just happened to be a broadcaster too banged out a series of books. That he had no medical background or knowledge and that his research consisted of anecdotes and random conversation didn't seem to matter. This time the whole blood type nonsense really caught on and it's remained so ever since.
This is why characters in Japanese computer games, cartoons and comics tend to have their blood type listed as though its as intrinsic as eye colour.
Even thought this blood type superstition is obviously bullshit a large section of the Japanese population doesn't appear to have noticed. Everyone in Japan knows their blood type. There are dating agencies where you can select potential partners by blood type. Facebook in Japan lists blood type in basic profile information (and no, you can't select "it's complicated"). There are even cases of companies hiring employees based on their blood group. Kids sometimes get bullied at school for having what's regarded as inferior blood types. It's sufficiently bad that there's even a word for it: bura-hara.
Crazy, huh? So what's your starsign?