A fantastic book series of elementary Japanese for everyone (who can speak English, though) to take up and then polish their Japanese skills. I really liked the layout of each chapter and its consistency - starting it up with a dialogue (translated), vocabulary bank, grammar bank and then, when you're ready to go - the exercises, including the listening.
However, it's advisable to purchase the workbook as well, as all of the writing systems, namely hiragana, katakana and then kanji, as well as the way to write them, is taught in the workbook. There is also a vast amount of reading material put there - without the translation, though, but that's the fun of it - you get to read and translate it yourself, while testing yourself whether you remember the kanji you'd learnt so far. I highly recommend this book (which consists of 2 parts) for any beginner of Japanese out there.