Really I don't know my blood type ( hontou ni jibun no ketsuekigata o shirimasen ) Mug

For better or worse, many Japanese people seem to believe that all personalities can be categorized into four types, based on your blood type. Therefore, you’ll most likely be asked what your blood type is at some point, if not often, during travels in Japan. As it is common for all Japanese to know their blood type however, many refuse to believe you don’t know what your blood type is… this shirt to the rescue! Often foreigners do not know their blood type, so instead of having that long and awkward conversation, you can stop it before it starts. Wear this shirt, and start a different conversation!