During a river‑side outing, Nobita discovers a stray dog struggling to stay afloat. Moved by the animal’s plight, he hides it in a wall‑mounted kennel, names it Ichi, derived from the Japanese onomatopoeia for a dog’s bark, and secretly feeds and plays with it using his Kendama. Later, he rescues a stray cat found in a rainstorm and names it Zubu (meaning “wet” in Japanese). With an ever‑growing number of rescued cats and dogs, Nobita and his friends decide to send the animals back 300 million years, to a time when no other living beings existed. After using the Ray of Evol…