The Tashiro family mansion wasn't located in the bustling downtown area of Tokyo. When the Tashiro ancestors built this mansion, it was still in the outskirts of Tokyo. However, over the span of more than a hundred years, Tokyo's city limits kept expanding such that the Tashiro family mansion, once in the suburbs, was now situated in one of the core areas of modern Tokyo.
As a high-end residential zone in Tokyo, the Tashiro mansion's location should have been quiet and serene at night. Yet the Tashiro family mansion was enveloped in gloom and darkness.