I had only been to Fuchu City six years ago when I was in police academy, so I saw it during that time?

— “A separate building on the north side.”

A voice suddenly sounded in Fujiwara Yu's mind, and he remembered the first case he had encountered. At that time, he believed a girl's words and went to the racecourse for investigation.

That girl was very similar to the 23-year-old girl named Matsuoka Chie in the photo. They both had three triangular moles on their right cheeks. Even though there were some changes in their appearance, the moles could confirm that they were the same person.

"Yingsi, what's wrong with you?" Yin Dahang noticed that there was something wrong with Fujiwara You's expression, and couldn't help but ask with concern.

Fujiwara Yu shook his head to indicate that he was fine. He picked up his suit jacket with a serious expression and walked out, saying something that surprised everyone except Yin Dahang:

"Hashimoto, go to the archives and retrieve all the cases that occurred in Fuchu City six years ago. Brother Hang, come with me. The rest of you stay where you are."

Sato Miwako paused as she picked up the cup. She looked at Mashiba Kenzo beside her with some confusion:

"Mashiba-senpai, don't you think the inspector is a little strange? How did he know the letter writer's appearance?"

"I don't know if you ask me, but the inspector rarely shows such an expression. I'm afraid we all have to work overtime today." Kenzo Mashiba shrugged his shoulders. He got up and made himself a cup of coffee, preparing to stay up late in advance.

While he was making coffee, his eyes fell on Hashimoto Yuji's computer screen. He vaguely felt that there were key clues in the case file that the inspector asked Yuji to retrieve.

What could it be? How could it be related to a case that was solved six years ago?