Mashin Eiyuuden Wataru: Owarinaki Toki no Monogatari

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The story is about a 9-year-old boy named Wataru Ikusabe who is magically transported to a magical realm of the gods called Sokaizan which he is supposed to save. He also befriends many of the Soukaizan natives, and forms some very strong friendship bonds. (Source: Wikipedia)