In the London City of 1888, there was a serial murder case in which a total of five sex workers were killed and their internal organs were being taken away.
The murderer who claimed himself [Jack the Ripper], sent a provocative letter to the police and claimed that he would continue to commit crimes. The police decided to find the most famous detective “Sherlock Holmes” to help find Jack the Ripper and prevent the murders from continuing.
It was at this time that YOU, the time-travel detectives, returned to London in the year of 1888, to assist Sherlock Holmes in the tracing of Jack the Ripper. After several days of investigation, you have locked the murderer in five suspect targets, but unfortunately at the same time, the ripper aware your existences and threats.
Therefore, Jack the Ripper set up a bureau and misleading you that ‘you thought’ you had found the scene of the 6th victim, fainted and locked all of you into the cage, and prepared to draw Holmes into the trap too.