Shironeko Project ZERO CHRONICLE

There was once a legend that revolved on two characters: the Black Prince of Darkness, symbolized by the Black Cat, and the White Maiden of the Sky, represented by the White Cat. At the same time, there was a conflict between the demons and the defenders of light, with the demons under the command of the Black King of Darkness attacking the skylands. However, the Black Prince disobeyed the Black King's orders and fell in love with the White Maiden in the hopes that their union would put an end to the conflict. As the conflict decimated the globe around them, both were not meant to meet and fall in love with one another.