Hyakki Ryouran no Yakata x Kawarazaki-ke no Ichizoku by Astronauts: Sirius - Adult Sex Game

A young man lost in a Western-style building built in a remote mountainous area, Aoyama Yoshito.
When he awakens up in the morning when he got to stay in the hall as a guest, there was a maid "Kotegawa Misako" not familiar to the hall.
What is a strange day and its conclusion that will be held in the Western-style building of the Kawarazaki family, on the stage of "Hundreds of Rebellious House"?