If she turns out to be in love with Kaoru, this would be a strange twist for the usual characterization in yuri manga. Usually you have a conflict where a character would hook up with a random man or a man related to her crush (Girlfriends, Blue, etc.).
The title pretty much tells us that it's not going to end well for them. Chiyo will probably move out and leave Landlady, once she realizes their relationship is going nowhere with all the fake contract and stuff. Then Landlady will commit suicide and haunt the apartment building as a vengeful...