Onimusha Soul is a web-oriented game based on the Onimusha series of samurai action games. The game is a Sengoku simulation RPG and features many cameos in the form of cards from other characters (mostly female) in the Capcom universe.

The game has players taking up the role of feudal lords during the Warring States period of Japan, using their powers to achieve the growth of their respective states and train military commanders as they fight with other players.