Notes of the Murderous House

My roommate disappeared inexplicably, leaving only a bloody thigh; the landlady knocked on my door in the middle of the night and asked me to run errands and sell things for her. Then I was implicated and taken away by the police. During the investigation, they told me that the charterer woman did not exist at all... Ever since I moved into that unfinished building, my life has suddenly undergone incredible changes...