故事讲述光月庵的老板娘・高月今日子（观月亚里沙）的幕后故事。作为七樱（滨边美波）的“强敌”，这厉害的角色，究竟心里隐藏着怎样的想法呢？为了让事情按照自己的意愿进行，他依次把可以作为棋子使用的人物叫到自己的房间。一旦进入，马上就会被纠缠的“女将的房间”。你也想窥探一下吗？说不定隐藏着解开神秘之谜的线索……

Kyoko is a woman of the high society and the worst kind of enemy one could ever wish upon their foes. She has spent her life raising her only son, Tsubaki, to be the successor of Kougetsuan. In this original Hulu series, we will learn more about her dark schemes as we enter The Landlady's Room. It may even be possible to make sense of the disturbing hymns she sings and unravel the mystery behind the murder of the Landlord 15 years ago.