Urashima Tarō is the title character of a Japanese legend about a fisherman who rescues a sea turtle and is rewarded for his kindness with a visit to Ryūgū-jō, the undersea palace of Ryūjin, the dragon god of the sea. In one version of the story, Tarō stays under the sea for three days and, upon his return to his fishing village, finds himself 300 years in the future.
P.S. This 8-bit pixel art Urashima Tarō is based on ukiyo-e art by Japanese artist Yoshitoshi Tsukioka. Though I almost designed 8-bit Tarō after George Suyeoka’s gorgeous illustrations in Urashima Taro (1973), a beloved book on my bookshelf.