The evil ruler of Dark Fall, he wants to take over the World Tree, and has managed to capture six of the seven fountains that irrigate it. He has sent out minions to search for the location of the last of these fountains, the Fountain of Sun. He appears as a shadow-covered, towering-robed demon-alike being with a pair of glowing red eyes that shine out of the cave in which he lives. His name comes from two words, "aku (evil)" and "daikan (a local administrator of Tokugawa shogunate)".

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