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Because at his daughter's wedding ceremony during the day, because of the groom Takasugi Toshihiko, the memory of his participation in the hunt for the serial murderer twenty years ago came to Matsumoto Kiyonaga's heart again.

So, I couldn't help but feel that Matsumoto Kiyocho, who had a headache because his daughter finally chose to be with Takasugi Toshihiko, returned to the Metropolitan Police Department after the wedding ceremony, and began to take out the file again, check the details of the serial murder case that has not been solved so far, faintly, touched the vertical scar on his left eye, Matsumoto Kiyocho's expression was solemn, it seemed that this wound that had long healed, began to hurt again today-

It's been 20 years......

The serial murderer who killed two people in a row twenty years ago and one person fifteen years ago, after so many years, there is no news at all.

And even if we take the prosecution period of that incident 15 years ago, it will not be a few months before the prosecution period ends.

Even if I don't have today's incident to remind me of this incident, when the prosecution period is about to end, I guess it will still be impossible for me to let go of this incident, and I will have to take the last opportunity to try to find out that guy......

But, after all these years.

Ever since that guy committed his last incident fifteen years ago, he hasn't heard from him since, as if he had vanished from the world.

Therefore, the only thing that can be relied on is only these clues that were found back then......

For this reason, Matsumoto Kiyocho, who was thinking like this, after looking at this pile of files that had been read countless times, Matsumoto Kiyocho still couldn't see any valuable clues, and the only clues that could be valuable might be ......

"Morimura ......"

Recalling the words that his boss who died in that incident and what he said to him on his deathbed, Matsumoto Kiyocho knew that perhaps unlocking that secret would make it possible to make substantial progress in the investigation......

But......

- "And, as far as I know, the serial murderer hasn't been arrested yet, has he?" ”

Suddenly, just when Matsumoto Kiyocho was suspicious of this, he couldn't help but think back to today, telling the truth of everything clearly, knowing the past of his daughter and Takasugi Toshihiko, and even the fact that he chased the serial murderer in the incident back then, and finally failed to arrest him.

I couldn't help but know that this wise detective had a very good reputation in the search lesson, and suddenly, Matsumoto Kiyocho thought that Takato, who could make the matter of his daughter and Takasugi Toshihiko so simple today, know something about the serial murderers back then?

After all, he knew that the serial murderer he was hunting down at that time had not been arrested.

So, thinking of this, Matsumoto Kiyocho, in order to try his best to successfully catch the serial murderer before the end of the prosecution period, Matsumoto Kiyocho also simply prepared to ask Takato to ask.

In this regard, Matsumoto Kiyocho ordered his subordinates to search a section and a police officer who was familiar with Gao Yuan, and invited Gao Yuan to assist in the investigation.

Therefore, after Takagi Shibu saw Takato at the door of the Metropolitan Police Department just now, he directly invited him to meet Matsumoto Kiyocho-

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