To let the dying dog Kintaro see its owner for one last time, Kagura and Katsura sneak it out of the hospital…only to find themselves caught in the war between the “Planet Eaters” (dogs) and “Planet Pukers” (cats), while Earth’s fate hangs in the balance. Escaping from the Planet Pukers, who are after Kintaro, the two head to the hospital where the old man is hospitalized. Meanwhile, the old man, who is supposedly in critical condition, goes missing. The old man’s children request Gintoki’s services, but when he arrives at the hospital…