Urashima Taro is a Japanese folktale where the hero takes a journey deep under the sea to visit the legendary palace of the Dragon King. This magical ocean voyage is his reward for saving the Dragon King's daughter. However, when he returns home he opens a magical box and suddenly becomes an old man who realises 300 years have passed since he left. You can read the full tale, with more art here:
https://www.curiousordinary.com/2021/07/urashima-taro.html?spref=tw&m=1
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