Crayon Shin-chan Movie 16: Chou Arashi wo Yobu Kinpoko no Yuusha

Shinnosuke unknowingly opens a gateway between the human world and Don Kurai, a dark realm whose ruler plans to invade Earth. Three legendary treasures stand between the two worlds: a golden spear, a silver shield, and a copper bell, and the enemy has already seized one of them.

Chosen by the golden spear, Shinnosuke is thrust into the role of a hero he never asked to become. With the mysterious Mata Tami and the Nohara family beside him, he must master the treasures' strange powers and close the path that Dark intends to use for conquest.