Navigation City Middle School seems calm and bright, but secretly it is tightly shrouded in a terrifying deal between ghosts and gods.
On her first day of school, freshman Youlijia received a piece of paper with rules that determined life and death from a mysterious senior sister.
The ten school rules contain hidden murderous intent, and there is a line of shocking small words written at the bottom of the note:
There is a 3 out of 10 probability that it is a false rule, please explore on your own.
On the shocking campus, she learned the darkest truth about the school from her deskmate Yu Qiu.
There used to be a dead body of water here, and there was a being named "Abyss" living under the water, which started killing people due to the intrusion of humans.
In order to survive, the school actually made a deal with ghosts and gods, sacrificing two students in the basement every year in exchange for temporary peace.
Taboos are strictly enforced, but dangers are everywhere.
The rules that are difficult to distinguish between true and false, the malice hidden in the crowd, and death that may come at any time...
Youlijia must identify traps in this deadly game, save her life, and escape from this cursed campus.
