I left the hamster on the balcony overnight, freezing his partner to death and completely freezing his docility as a pet. It began to mutate, learn at a speed beyond common sense, and carved the first warning into my palm with its claws. When pets all over the world fell into madness one after another, I was horrified to discover that the pet I raised with my own hands was actually the original source of this disaster. In order to survive in a collapsing world, I must learn to coexist with this most familiar and deadly "family". In the apocalypse, the old favor has become poison, and there is only one new law: either tame the nightmare or become its food.