Pei Yu, a high school transfer student, returned to Qingwu Middle School after a year's absence, just to find out the truth behind his friend Lin Ran's "suicide by falling from a building". On his first night at school, he triggered the "campus sign-in system" in the abandoned laboratory building. As long as he completed sign-in in the school's restricted areas, abnormal locations and rule conflict points, he could obtain ability fragments, on-site traceability and identity permissions. At the same time, a supernatural organization called the "Zero Sequence Club" is using the entire campus as a screening ground, using daily routines such as examinations, clubs, dormitories, radio broadcasts, and school celebrations to quietly select students with special abilities who can board. On the surface, Qingwu Middle School is calm as usual; secretly, teachers, top students, discipline committee members, school doctors and even security guards may all be replaced pawns. Pei Yu is not good at saying nice things, but he protects the people he recognizes the most. While signing in for upgrades, he recruited dormitory brothers, radio station girls, and marginalized genius classmates to reverse the rules within the rules and fish in reverse under surveillance. But the deeper he investigated, the more he discovered that Lin Ran was not dead, but was used by Zero Order as a "living key" to open the core restricted area of the campus. This time, Pei Yu not only wants to win the game, but also brings out all the people who are targeted.
