That day, Tomoki Ozora was unlucky from the start... He was teased by his classmates, nearly stepped into a garbage bag, and the game he had reserved was sold due to a store clerk's mistake... But what happened after that was beyond anything that could be described as bad luck. An unprecedented meteor shower struck the earth, and when he woke up, the world had changed. Creatures he had never seen before, giant, rampaging stray dogs... At Tomoki's house were Mike, a cat who had taken human form, and Rikuo, a dog. In order to find his missing childhood friend, Nozomi Hoshino, Tomoki takes the two of them on a journey through the desolate world...