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You will pick up how to speak Japanese while living there for awhile. However, you won't be able to learn how to READ or WRITE Japanese unless you take classes. So you'll be more or less illiterate unless you take classes beforehand (or you can take them in Japan). Also, do visit Japan before making the life-changing decision of moving there. Being an anime fan isn't exactly a justification to move to Japan, and many people often find that daily life in Japan isn't quite as they expected once they're here.