Doraemon the Movie: Nobita and the Birth of Japan 2016

Doraemon and his friends travel back in time to the Paleolithic era, around 70,000 years ago, where they aim to build an ideal private paradise. After enjoying their freedom, they return to the present, but soon encounter a caveman named Kukul who was accidentally transported forward in time. This encounter leads to the discovery that Kukul's tribe, the Hikari, was attacked by the Kurayami tribe and Giga Zombie, prompting Doraemon and his friends to return to the past and help the Hikari tribe.