A group of time travelers decided to return to the past to subdue the serial killer; Jack the Ripper, in order to change the outcome of the future. As they attempt to do another leap (after several failed attempts) on their pursuit, the group arrived at the wrong year due to a certain error-- from which at present Jack the Ripper was still a young boy, an accident which eventually leads to a certain dilemma; should they annihilate the future killer before it's too late or would it be possible to change him during his childhood in order to complete their duty?