When I was taking a drama class in college, we were all assigned to write a play made for children. I chose to do mine about うらしまたろう（浦島太郎)! Urashimataro is a Japanese folktale about a young boy who rescues a turtle and in return is invited to a palace under the sea. You can read/listen to the story in Japanese here. I went on to teach second grade, and decided to actually direct the play I had written for our end-of-the-year production! We practiced and practiced and the show turned out to be adorable.
Anyway… just a long intro as to why I love Urashimataro! I think Japanese folk tales are awesome, even though they often have interesting endings (I guess similar to the original Grimm’s fairy tales).
Here is a YouTube video of Urashimataro byまんが日本昔ばなし：
Urashima Taro coloring page here.