although the protagonist changes in every "onimusha" title, he is always a skilled swordsman who embarks on a set mission which involves slaying demons and fearsome enemies during the waning years of the sengoku period of feudal japan. in each game, the protagonist has the ability to absorb genma souls from defeated enemies, which help to restore health, infuse power in weapons and armor, and provide power for the elemental attacks of special weapons.