is the first Japanese feature-length animated film. It was directed by Mitsuyo Seo, who was ordered to make a propaganda film for World War II by the Japanese Naval Ministry. Shochiku Moving Picture Laboratory shot the 74-minute film in 1944 and screened it on 12 April 1945. It is a sequel to Momotarō no Umiwashi, a 37-minute film released in 1943 by the same director and also starring the traditional Momotarō character.

Plot

After completing naval training, a bear cub, a monkey, a pheasant, and a puppy say goodbye to their families. While they are preoccupied, the monkey's younger brother Santa falls into a river while chasing the monkey's cap and is carried towards a waterfall. The dog and monkey coordinate a rescue to save Santa just before he is swept downstream. They succeed and the monkey and his little brother then enjoy the scenery of Mt. Fuji and the surrounding land. While Santa frolics in the field chasing the cap in the wind, the monkey observes the dandelions spreading their seeds and is mesmerized by its beauty. The dandelions floating gently down remind the monkey of paratroopers descending from the sky, transitioning to a time skip. The Japanese forces are seen clearing a forest and constructing an airbase on a Pacific island with the help of the jungle animals who sing as they work. A plane lands at the airstrip and from inside emerges Momotaro, depicted as a General, together with the bear, monkey, dog, and pheasant, who by this point have become high-ranking officials. The animal residents of the island are shown as simple primitives who are star-struck by the glamorous and advanced Japanese animals. The subsequent scenes show the jungle animals being taught the Japanese kana via singing and they continue to sing the AIUEO song while washing and drying clothes and preparing meals. The officers then prepare ammunition and artillery for the warplanes.