But every once in a while, I just cringe. The next volume of Sho-Comi features a special additional book that's all about catching men based on their bloodtype.
See, Japan uses bloodtype the same way we use the zodiac: your bloodtype says certain things about who you are as a person. This is why in most detailed character profiles, you'll find the character's blood type, which may seem like a random piece of information to westerners.
(Actually, some people THINK we use this in the west too, but the "type A personality" concept actually comes from a 1950s psychological theory, not blood types-- though there are also "type B" and "type AB" people within that theory. It really wasn't a very good naming concept.)
So the blood types are:
Which type are you based on your blood? Which one SOUNDS more like you? ALL of them sound like me. And none of them. Hm..