The Kaiju ("World-Tree") are gigantic magical trees found on planet Kaishin. These trees grow magical apple-shaped fruits, which in turn sprout a race of deities known as Shin-jin. Some Shin-jin are selected to possibly become Kai or, if born from a golden fruit, automatically become Kaioshin. Evil Shin-jin born from the fruit are cast into the Demon Realm ruled by Makaioshin in order to be separated from civilizations, and they become Makaio.

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