If you’re a recent arrival to Japan, don’t worry if a new friend asks “What’s your blood type?” Your inquisitor is unlikely to be a vampire. Here, blood type is believed to tell a lot about a person in just a letter or two: A, B, O or AB.
Blood type is thought to lend insight into character and compatibility, which is why it often comes up at group nomikai (as a lively discussion over drinks) and, of course, among the romantically minded (as a sort of litmus test).
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