In the dead of night, the entire student body and faculty of High School Class 3-7 are suddenly transported into 'Metro Survival,' a post-apocalyptic world ruled by brutal game mechanics. Everyone awakens completely naked in a train carriage hurtling through endless dark tunnels, stopping occasionally at perilous, unknown stations. Because Lu Yuan is the only male in the entire class, the system detects a severe gender imbalance and triggers a special clause—the 'Propagation Protocol.' If a male and female in the carriage complete mating on a completely voluntary basis and successfully trigger a pregnancy determination, both will receive a massive, permanent Leap in all of their attributes. With the weight of survival on his shoulders, Lu Yuan must lead his female classmates to stay alive, grow their population, and conquer this terrifying new world!