That's alright don't worry ^^ I'm glad to see people from back then! I've been well thanks, can't get too far away from Arashi, so I'm back XD

I have 12 books and the main edition is this one. You can search for ピアノソロ ベストヒッツ. I like their arrangements more and they cover many songs. The downside is, as I only found them on amazon.co.jp, the shipping costs (at least for me who lives in France) cost an arm XD Some other books I found in Japan in libraries.