A big mistake from Tecmo Koei
Tecmo Koei included Sangokushi VII instead of Sangokushi VIII in the Sangokushi VIII UMDs.
Tecmo Koei has re-released Sangokushi VIII for PSP yesterday in Japan but... they had a big mistake!! as they included in the UMD Sangokushi VII instead of Sangokushi VIII.
Tecmo Koei confirmed the mistake at the Game City portal site and they halted all the sales of the game. They're now arranging a replacement program for current owners.
NEWS SOURCE #1: Sangokushi oops (via) Andriasang
NEWS SOURCE #2: Info #120712 (via) GameCity
Our thanks to 'Robe24' for this news item!