She is a person with various sexual orientations. She is a gentle and lovely girl during the day, but at night, she turns into a murderous female killer in the dark. She is called "Snow Shadow" but some people call her "Blood Shadow" because she always wears white clothes when she kills people and turns bloody after killing. No one knows her true face. And her past. A trick of fate caused her to travel through time and space in an explosion. It was an unknown era, full of murders, and she was born into a cowardly queen. Everything has changed since then. She changed. But unknowingly, a feeling is slowly spreading. What is that? Push open the eighth door. What will be her ending?