The Tōjū Campaign is an event in which berserk Zanpakutō Spirits run rampant all across Seireitei in the wake of Muramasa's Rebellion, threatening to disrupt the peace brought after the conflict was resolved. These Tōjū were released as a direct result of Muramasa's abilities, and as such are in a constant Bankai state. The last remaining Tōjū, Kirikaze, gained the ability to absorb Reiryoku, threatening the existence of the Zanpakutō Spirits.