Yu Nan, an ordinary person from the 21st century? In 1937, the country that knew everything was known was passed away due to a car accident.
When he woke up, he became the new student in school - Ryozo Ishiguchi. There are still inhuman memories of the original owner being subjected to freezing experiments in the "XXXX Force" in his mind, as well as a just-sent report letter - the target of the report is his and his sister's savior, an intelligence officer of the Blue Clothes Club.
What's even more ridiculous is that the country's intelligence agency followed suit and planned to train him as a latent spy, codenamed "Mei", with the goal of breaking into the mainland intelligence network.
On one side is Yushi Nomura, a classmate and funder who is full of XXism, on the other side is Xu Jingshan, a Japanese intelligence officer with a mysterious identity and also of Chinese descent, and Miyuki Mukai, a high-end call girl studying in the United States who hides a Chinese password notebook...
Yu Nan knew that there was less than a month left before the "Seven×× Incident".
The history of this plane highly overlaps with that of Earth.
And he is the "observer" thrown in by the system.
——But who stipulates that observers can only stand by and watch?
