Two, actually! 'Sai' is the art book that came out when HikaGo was still running and is entirely material from Hikaru no Go. 'Blanc et Noir' came out when Death Note was almost over - the first half is all DN, followed by some other stuff and then a big HikaGo section full of new(ish, the books about three years old now) art. It's expensive - I paid $65 for it - but totally worth it. There's a bunch of fold out spreads, pictures with special ink or paper, plus it's huge (can't fit it standing on any of my bookshelves) and comes in a swanky slipcover.
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[coughs] They're nice books, is what I'm saying.
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In the mean time I recieved the Character guide in the french version; soooo much easier to read!