Ninja Mansion

Ninja Mansion (忍者屋敷) is a room presumably located on the 9th Floor of the Great Tomb of Nazarick.

Background
The room was created by Garnet for Nishikienrai to serve as his personal playground while acting as a ninja. It was also the location for the guild's "Ainz Ooal Gown High School Trip".

Layout & Features
A Japanese-style room that includes sliding screen doors. The room was suppose to allow one to feel like a ninja. In addition to that, there are several gimmicks like a ceiling door and a revolving hidden wall.

Trivia

 * There are apparently many ninja mansions located in Nazarick made by Garnet.
 * A video production of the room was incorporated into Pachislot Ainz Ooal Gown.
 * There also is a Demon Seal Jar in a closet, but whether its a decoration or a trap is unknown.