In this world, there are spirits called "Yokai" born from the accumulation of energy called Qi created when human emotions are exposed in one spot for over a prolonged period. This energy can be harnessed and controlled by humans, giving rise to sorcerers who can use it to perform phenomenal feats and even form bonds with Yokai. Despite this technological advancement, there are still Yokai who despise humans and will stop at nothing to bring them down.