Legend of Shirahone Swamp

In order to capture Matenro, the special training of the Hadogumi continues. However, Yasuko's special training menu was difficult for Hiroshi and his friends. So they consulted Mr. Ochiai. Ochiai called Yasuko and told him to think about the contents of his special training. However, on the way home, Yasuko suddenly travels through time and space to a mysterious village. Yasuko is asked by the villagers to exterminate the White Bone Princess...