Just when you thought your wallet was safe...
Phantasy Star ALL!!: Books 16 - 21 20 have all appeared!
Book 16:
http://page8.auctions.yahoo.co.jp/jp/auction/h154688717
Book 17:
http://page16.auctions.yahoo.co.jp/jp/auction/u35736569
Book 18:
http://page10.auctions.yahoo.co.jp/jp/auction/m85701268
Book 19:
http://page10.auctions.yahoo.co.jp/jp/auction/m85701256
Book 20:
http://page16.auctions.yahoo.co.jp/jp/auction/u35639062
Book 21 21st Anniversary of PS Phantasy Star All!!?:
http://page8.auctions.yahoo.co.jp/jp/auction/h154688697
Alternate cover art for book 21 perhaps? Perhaps someone should buy this one too... just to confirm it. Got to looking at this more closely and realized that there are two characters from PSO and one from PSP featured in the cover art. Conclusion, a special issue to commerate the 21st anniversary of the PS franchise, that's my guess at least.