After meeting his demise during a duel with a famous detective at the waterfalls of Reichbach on May 4th, 1891, Moriarty wakes up in the body of Sherry Moriarty, a 16-year-old girl who attends Earl Blue Academy and was about to take her own life due to excessive bullying. After seeing the pitiful conditions that Sherry has endured so far, Moriarty decides to act like a gentleman and join hands with Sherry, so she can take revenge on her bullies and starts using his top-notch brain to craft the perfect plan.