"They say Cat Island has everything you could want. Soft grass and trees that give shade, and warm sunshine. They say we can lie on the grass and sleep in the sun." An adventure story of cats dreaming of escape from a hellish city to Cat Island! Bell and Poke were cats living ordinary days in Mrs. Choi's house. One day, something terrible happens to these cats. A mysterious virus called the M Virus, which leads both humans and cats to death, spreads across the world, and people, gripped by fear, begin abandoning and killing cats... Bell and Poke, who once lived safely in a loving home, are suddenly abandoned overnight and become stray cats. Fleeing from people trying to catch and kill cats, they happen to meet stray cats One-Eye, Lulu, and the Boss, and end up hiding and living together on the streets. From them, they hear about Cat Island, said to be a paradise for cats. Where could this peaceful Cat Island be, filled with warm sunshine, cool shade, and delicious food? Will Bell, Poke, and the other cats finally find happiness on Cat Island?