If you're looking for anime similar to Nihon-ichi Momotaro, you might like these titles.
Issun-boshi, a miniature boy, bids his parents farewell and floats down a river in a soup bowl with chopsticks for oars and a sewing needle for a sword. Now on a grand adventure, Issun-boshi meets a princess, battles a demon and saves the day!
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These two anime are some of the earliest examples of Japanese animation that both recount traditional fairytales about boys who are a bit different fighting demons and ogres.
Taro, a strong and powerful samurai, is lounging on a hillside when he’s suddenly assaulted by a large demon hand! From there, he must battle a variety of evil spirits with rocks, his fists, and whatever else is available – with even a bear by his side!
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Both of these early animations depict men battling with Japanese demons, so if you liked that in once, you may want to try the other.
One day, a kind fisherman saw a giant sea turtle being bullied by a pair of children. Out of empathy the fisherman pays the children and saves the turtle – but he’s no ordinary turtle! Soon after, the man embarks on a grand adventure under the sea, with the help of his newfound friend.
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Both Urashima Taro and Nihon-ichi Momotaro are old anime shorts based upon classic Japanese folktales, so if you hold more than a passing interest in fairytales form around the world, it's well worth checking out both of these.
One day, the lazy fisherman Sanko is presented with a map and a promise of treasure, so off he goes in search of fame and fortune. Sailing away on a boat through rocky seas, the man finally finds himself at the treasure – but what he finds there is not quite what he expected!