Conan and others are studying in the library of Didan Primary School. At this time, Teacher Kobayashi found something in the crack of the bookshelf. It's an old leather wallet with 1 piece of paper in the middle. Conan has a feeling of deja vu about this wallet ... 10 years ago, Xinyi and Xiaolan, first-grade primary school students, sneaked into the primary school library on a full moon night in order to find out the truth of the rumor that the school was haunted. There, Shinichi got his wallet from the mystery man and accepted the challenge of reading the password recorded on the paper …

Conan continued to talk about the memories of the wallet in the library. 10 years ago, Shinichi, who accepted the mystery man challenge, deciphered the No.1 1 and No.2 code together with Xiaolan and Agasa Hiroshi, and the No.3 code "Destroy Okuho's evidence and bite loneliness with a muddy voice" Shinichi deciphered the first half of the code and went to Dajing Post Office. Because the first two times were to hide the secret code on something red, so the new one went straight to the red mailbox to find out the clue …

Hide and seek: the plot of the ninth edition of the play

Conan remembered when the juvenile detective team was playing hide-and-seek with Xiaolan Garden.

Be beaten:

032 coffee shop murder (コーヒーショップ murder) 1996/09/09 ┣ Comic code1/kloc-0. File 5

Ian lied that he had a new date. Conan specially followed Lan to the coffee shop for this purpose. Just when he wanted to know who Ian was dating, another murder happened ... It was Lan's mother Fei Yingli who fought alongside Conan.