MB Japanese Astrology Compatibility is a blood type based compatibility software. This method of knowing people’s traits and their compatibility with each other is very much practiced in Japan. This Japanese method of personality matching is as popular as matching horoscopes is anywhere else in the world. MB Japanese Astrology Compatibility is a blood type personality astrology / compatibility assessment tool. This is based on the Japanese way of compatibility assessment on the basis of a person’s blood type. The software tells you more about your characteristics as well as the level of compatibility with people of other blood types.