If you never heard of this game, well too bad for you. I enjoyed the anime. It has the international release before on PS2 called Demon King. Maybe it is not as good as Sangoku Musou series for the international, which makes the second series is not released for N.A.
Well anyway lets get into some of the synopsis. Each character will have their own storyline from the old character (Sanada Yukimura, Date Masamune) to the new character (Ishida Mitsunari, Tokugawa Ieyasu) which is all related to the event. New moves, modes and gameplay will add more fun for this installment. You can check out the video as well.