Doraemon Movie 29: Shin Nobita no Uchuu Kaitakushi

While Nobita sleeps, he feels the floor tremble, as if an earthquake were about to strike his room. A small rabbit from an alternate universe named Chamii uses a hammer to open a dimensional door that burrows through the floor into Nobita’s bedroom. When Nobita wakes, Doraemon hears someone pilfering food from the kitchen fridge; it is Chamii, who is promptly caught by Doraemon and Nobita. She then shows them a passageway beneath the floor that leads to a spaceship. Boarding the vessel, they arrive at the Koya Koya planet, where they meet a boy named Roppuru.