A survival game for everyone, with a System and an invincible protagonist. Everyone on Blue Star, regardless of gender, age, beauty, or disability, transmigrates to a world of elevator survival. From the start, each person gets an elevator and nothing else. An electronically synthesized voice called the Game Administration says that to survive, they must explore new floors, which refresh every twelve hours. But one night, he discovers that he can see information about each floor. A prompt says: "Elevator descending. Please hold on. Host, the floor you are about to enter is a restroom floor with no major resources. You can collect water from the restroom tap. It's fairly clean, so you can drink it if you don't mind." The elevator moves upward. Please hold on. The floor you are about to enter is... From then on, this prompt makes him invincible.