Aichan can be found by traveling the main road north from the Gates of Madness and following the first turn to the northwest. It lies on the northern edge of The Laughing Coast, west and a little north of Wretched Camp.
The layout is a fort ruin with a cave area.
Aichan serves as the prison for the Golden Saints and the House of Mania. It is possible to enter as with Corpserot Passage but there will be only enemy creatures there unless one has been thrown in prison when there also will be Golden Saint Guards present.