Grammar / Vocab
It can sometimes seem that there are simply too many distinct problem areas to master in Japanese - the kana, the kanji, the particles, the verb tenses, polite Japanese versus actual Japanese, etc etc. Fortunately there are a number of excellent books to help hit each of these sticking points right where it hurts most.

In particular, I have to give a special shout out to the Naoko Chino / Power Japanese books, which I've always found very helpful, if a little staid. If you're a geek like me, though, and appreciate things being laid out in an otaku-friendly manner (i.e. exhaustively comprehensive tables) then these are your boys.
Japanese Step by Step: An Innovative Approach to Speaking and Reading JapaneseA Dictionary of Basic Japanese GrammarJapanese Verbs at a Glance
Japanese Step by Step: An Innovative Approa...
by Gene Nishi
£7.19
Written by an IBM engineer, this book should appeal to those of you who like to base your study around patterns. And flowchart...
A Dictionary of Basic Japanese Grammar
by Seiichi Makino; Michio Tsutsui
£36.13
I found this book really useful when starting out (and there's a sister volume for intermediate grammar too). It's not the bes...
Japanese Verbs at a Glance
by Naoko Chino
£6.81
The page layout is rather pedestrian and crowded, but it's as comprehensive as anything I've seen and offers very clear breakd...
All About Particles: A Handbook of Japanese Function WordsHow to Tell the Difference Between Japanese Particles: Comparisons and ExercisesOutrageous Japanese: Slang, Curses and Epithets (Tuttle Language Library)
All About Particles: A Handbook of Japanese...
by Naoko Chino
£6.39
Another good "All About..." book, again very comprehensive. Covers all the various meanings and usages of every particle you'v...
How to Tell the Difference Between Japanese...
by Naoko Chino
£7.94
Another solid Naoko Chino effort. There's some overlap between this and the "All About Particles" volume, but in general they ...
Outrageous Japanese: Slang, Curses and Epit...
by Jack Seward
£8.55
You'd be forgiven for thinking that there were no swearwords in Japanese... time to set the myth straight. The slang section i...
The Handbook of Japanese Adjectives and AdverbsLove, Hate and Everything in Between: Expressing Emotions in JapaneseThe Handbook of Japanese Verbs
The Handbook of Japanese Adjectives and Adv...
by Taeko Kamiya
£11.42
Love, Hate and Everything in Between: Expre...
by Mamiko Murakami
£7.79
The Handbook of Japanese Verbs
by Taeko Kamiya
£7.77
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