It’s interesting to point out that blood type science is taken seriously in fields like relationship, health, diet and many more. Have you seen books written by dietitians pointing out which food and veges should be eaten by people with type O, which sports should be avoided by type B and so on? The Japanese takes blood type importance a step further whereby having blood a type gives you higher chance to land a job. They also kind of believe that A won’t go with B, but ok with AB and so on.
What is your blood type?
Do you know that blood type can classify people’s character? This is done by Japanese. This is the reason why Japanese always ask people blood type.