I came here a few months ago to take over for my father, who passed away suddenly, in a rental apartment in a quiet residential area dedicated to youkai.  There was Yukino-san, a very fragile and beautiful widow who had lost her husband.  In her father's room, there was a ring that could only be used to control youkai at will.  The ring was supposed to help Yukino-san's needy life, but as her own desires took over, things took an unexpected turn...