A teahouse to the north of the shoin (study hall) is the size of four tatami mats plus one of less than normal size that is said to be modeled on the Mittan Teahouse at the Ryuko-in sub-temple of Daitoku-ji Temple.
書院の北に接する四畳半台目の茶室で、大徳寺龍光院の茶席「密庵」（みったん）の写しといわれる。