From MangaHelpers:

Inukai Kirara is two months behind on her rent, though the elderly man who is the apartment landlord has just been kindly letting things slide. One day, the old landlord's granddaughter, Kitakaze Ruru, shows up in Kirara's room to tell her that he is hospitalized, and that she's going to be taking care of all the back rent. Apparently, the old landlord's goal was to create a love comedy harem, and so he had let many of the inhabitants fall far behind in rent. Ruru is determined that she is going to get these messy and unruly tenants in line! [tethsydust]