If you are looking to actually understand Japanese and not just how to say "hello" or "cat" and "dog" then grab this mobile textbook right away. Im still going through the lessons but I learn so much about grammar and sentence structure that I understand simple paragraphs quicker than when I was reading other books. Its easy to google vocabulary so if you looking for lessons that will actually teach you how Japanese people think when they write/speak(because not a direct translate to English like Spanish and Italian) then download this NOW!
Kimays about Learning Japanese, v2.0.2