|town_laws=Independent<br/>[[Youkai Nation]] laws
|travel_north=N/A
|travel_east=[[Intersection 03]]'''(_/_/<span style="color:#FF0000">D</span>)'''|travel_south=[[Caminus]]'''(_/_/<span style="color:#FF0000">D</span>)'''|travel_west=[[Cloud Ten]]'''(_/_/<span style="color:#FF0000">D</span>)'''
}}
'''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]].
The local ammunition factory, opened in E7-217, is the first 100% youkai-owned and youkai-operated factory of its kind, sourcing most of its raw materials from the [[Kazama]] mines.
Headstamps of ammunition produced at the Aosaidan factory are typically marked with the letters '''AD'''. There is no official explanation for what these letters stand for, but the most commonly-accepted theory is that they are a shorthand for "'''A'''osaidan '''D'''anyaku" (青祭壇 だんやく), which translates to "Aosaidan Ammunition".
* Residential hub:
** [[Residential area]] levels: 8
** [[Hotel]]: NoYes - ''Kaneda'' (金田)
* Shop hub: 4 of 10 emplacements open
** [[Delicatessen]], [[Forge]](''Konpaku Blades''), [[Weapon Style shop]], [[Style Weapon shop]](''The Close Quarters Company'')
* Social Square facilities:
** [[Bar|Bars]]: 1 ; ''Dream Bar'' (#1)