Wataru, a fourth grader, is once again taken to Shinbukai, a world in another dimension, as its savior, ten days after he had last returned from there. He heads for the Soukaizan, invaded by the Donarukami family from the dark world. Wataru enters the Soukaizan with Himiko and Shibaraku. As they meet new friends along the way, they also bravely confront their enemies. Will Wataru be able to stop the Donarukami’s plot?