Xiūxí (Break) is a youkai — a nekomata, specifically. She is described as a bitchy, lazy, and lesbian imposter of the Gold Level Courier of the Inazuma-based Komaniya Express named Kirara. Her goal is to cause chaos in Komaniya Express while getting Kirara fired to the point of making her return to being a youkai in the mountains. Appearance-wise, Xiūxí is an exact duplicate of Kirara, save that she has a Pyro Vision disguised as a Dendro Vision.