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Synopsis

Nobita is roused by an unusual shaking beneath his bed and discovers that a small rabbit-like visitor from another realm, Chamii, has created an opening between worlds with a hammer and emerged through the floor. Doraemon, alerted by sounds in the kitchen, encounters Chamii while she is taking food and apprehends her alongside Nobita. Chamii reveals a pathway beneath Nobita's room that connects to a spacecraft. When they follow her through the passage, they arrive at the Koya Koya Planet, where they encounter a boy named Roppuru.