Sengoku 2

In Sengoku 2, a warrior from the future is summoned by a prophetic princess to feudal Japan, where an evil monarch has gained supernatural powers to control the dead. The player must battle through armies of reanimated souls to restore peace to a land where the weak have fallen prey to the strong.

The story given by SNK is as follows

"A time of Sengoku, it's the weak becoming the victims of the strong. It began when a monarch got evil powers. He awakened peacefully sleeping souls and used his power to control them.