MB Free Japanese Astrology - Version 1.0 MB Free Japanese Astrology is a blood type based personality software. This method of knowing people’s traits 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 Free Japanese Astrology is a blood type personality astrology / 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.