While Nobita sleeps, he abruptly senses the floor shuddering as if an earthquake were about to hit his room. A tiny rabbit from another universe called Chamii cracks open the dimensional gate with a hammer and slips into Nobita's room through the floor. Nobita wakes, and Doraemon notices someone pilfering food from the kitchen fridge. It turns out to be Chamii, who is caught by Doraemon and Nobita. She reveals a passage beneath the floor leading to a spaceship in the shimmering corridor of stars, glowing. Once aboard, they glimpse the Koya Koya planet and encounter a boy named Roppuru.
Shinei Animation Japan