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'''Aosaidan''' (Youkai-go: '''青祭壇''', lit. pronounced ''ah-oh-sah-ee-dan'', lit. "Blue altar") is a small [[Youkai Nation]] town located in the Northern Zone.
Aosaidan was founded in E7-215, sometime during the month of Penultima, as part of the [[History of the Mazes#Era 7|Youkai Expansion Plan]], to answer the needs of an ever-increasing [[youkai]] population. Aosaidan transliterates to "Blue altar"; the origin behind the town's name is unknown, but it is believed to have a connection with the neighboring Angelic capital city, [[Cloud Ten]].
