Shortly after being transported to another world, Kurumi Tokisaki becomes interested in a specific white cat. To Kurumi's disappointment, the two are separated. Kurumi subsequently encounters Hibiki Higoromo, a white-haired quasi-spirit. Hibiki explains that they are at the center of a killing game involving quasi-spirits. In the Neighboring World, these spirits compete for a single wish to be granted to the sole survivor of the death match. Having understood the rules of the game, Kurumi and Hibiki reach a compromise: a temporary alliance.