Before the extreme cold apocalypse, the country assigned beasts to control. The reborn school beauty took away the F-level black bear from my previous life and gave me the SSS-level nine-tailed silver fox. I unexpectedly discovered that the silver fox could talk, the black bear had been reborn, and he had formed a master-servant contract with the school beauty. The end of the world is coming half a month later, and the silver fox, who is afraid of the cold, could not survive the first day in his previous life. In this spirit beast exchange, can I rely on the tacit understanding between the silver fox and the black bear to survive in the end of the world?