This is one of the most bizarre incidents that I know of.An impossible crime like this, I don't think, has ever happened in this world before. In the eleventh year of the Showa era (1936 AD), strange incidents of serial killings occurred in Tokyo.However, it is impossible for anyone related to this incident to complete the murder in the case.Therefore, this can be said to be a murder case where the murderer cannot be found. (It is not an exaggeration to describe it in this way.) This murder case is like a maze with no exit.For more than 40 years, many people in Japan have racked their brains to find out the murderer.But in the spring of Showa 54 (1979), when I was involved in this case, I was still stuck in the maze and had no clue.

In fact, there are detailed records of this case, and all the clues to solve the case have been made public one by one. Why is there still no one who can solve the mystery?Perhaps it can only be said that this case is too incredible. In the process of describing this story, this book will present all the clues needed to solve the puzzle in a clear and open form before readers.