One kana character per page spread (hirigana on the left side of each spread, katakana on the right); a sample word using the kana on each page; a paragraph putting the word in cultural context; and a manga-style illustration.
It's a simple and effective formula... much the same one as used in Jimi's Book of Japanese, which we purchased last year. However, Kana de Manga appeals to a slightly older kid. My 12-year-old daughter declares herself very pleased with it. "Jimi" is a larger book, much more nicely produced (glossy paper, heavy cover, color) but seems pitched at the younger set. Also, you have to buy separate Jimi books for hirigana and katakana; this one combines both in one volume.
I particularly appreciated the fact that the hirigana words were mostly Japanese words, whereas the katakana examples were typically foreign loan words--reinforcing the fact that this is how the two syllabaries are used in real-life Japanese.
Considering that my kiddo has had the book only two days and is already telling me that "kiku" is chrysanthemum and yon-yon (4th day 4th month, or April 4) is Yo-Yo Day in Japan, I think I can safely say the book was a good investment.
Oh, about the "is it complete or is it not?" debate between previous reviewers--they're both wrong :-) The kana characters, when modified with the dakuten (two little lines) or handakuten (tiny circle), do indeed become different "letters" (really syllables), just as an N (en) and an N-tilde (enye) are two different letters in Spanish. The page-by-page treatment in this book covers only the basic 46 kana characters. However, the introductory material covers the use of the diacritical marks (dakuten changes K->G, S->Z, T->D, and so on; handakuten changes H->P). It also touches on doubled vowels and consonants.
Personally, I'd have liked to see these modified characters get their own pages--it's one thing to say "oh, and apply this rule to get that" but much better would be to show examples of the rule. But it's not a deal-breaker, especially for a book priced under ten bux.