James Moriarty, the most fearsome criminal, met his demise after a confrontation with a famous detective at a certain waterfall. He found himself possessed by a beautiful young lady from another world, and what he saw there was the insidious abuse by other noble daughters. He has no memory, but his brain is still the same. He wields the power of his lucid mind and the perfect crime equation to the fullest for the sake of only one girl in a world without a great detective. The bullied young lady dies and is reborn as Moriarty, a villainess without blood or tears.