The spin-off on Watashitachi wa Douka Shiteiru.

The story will shed some light on the inner workings of Kyoko, the Landlady of Kougetsuan, and mother to Tsubaki, as she tries to take down Nao. 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. We 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.