For years, Ura Saito has been living a peaceful life managing an Inn called Urasai passed down to him from his father, and it's full of ghost girls who are more or less treating him with unusually high affection.

Everything changed on his 20th birthday, when all of the ghosts suddenly turned on him and targeted his life - it turns out that his ancestors have committed great sins toward those ghosts and they've been patiently waiting till Saito became an adult in order to extract revenge on him. In the middle of this chaos, a shrine maiden named Mikuhara Sayo suddenly shows up claiming that she's going to protect Saito, but usually does the opposite and he ends up worse...