小学4年生の戦部ワタルは、龍神池と呼ばれる池から現れた守護龍に「神部界」という神々の世界へと連れて行かれる。その中心に存在する神々の山「創界山」に突如現れた隠れもなき支配者、悪の帝王「ドアクダー」が神々と創界山を支配していた。本物の「魔神」となった龍神丸と共に、創界山の象徴である七つの虹を取り戻すため、ドアクダー退治へと旅立つ。
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Fourth-grader Wataru Senbe is taken by a guardian dragon that emerged from a pond called Ryujin Pond to the world of the gods known as the “Divine Realm.” At its center stood the Mountain of the Gods, Sōkaiyama. Suddenly, an undisputed ruler appeared there: the evil emperor Dokudā, who ruled over the gods and Sōkaiyama. Alongside Ryūjinmaru, who has become a true “Demon God,” Wataru sets out on a journey to defeat Dokudā and recover the seven rainbows, the symbols of Sōkaiyama.