In the 1900s in America, an unknown pandemic disease spread at a rapid rate, and it was a disastrous era threatening the survival of humanity. There was a mysterious group, under a leader code-named D., gathered for the purpose of attaining immortality.
In a small, quiet town in the countryside sat an old house, and suspicious people and children started visiting the house often. It was said that a scary old lady, who wielded a bat, lived there.
What secret was hidden in the house?