Weird asylum, you take me in as a human?

Story of: Weird asylum, you take me in as a human?[No System] + [No Routine] + [No Female Protagonist] + [Cthulhu] + [Male Protagonist Crazy Criticism] (There is no pretense and slap in the face plot, so please enter with caution!) The dark prison merges with reality, it’s weird Creatures infest the world through 'gates'. An organization was quietly born, and they called themselves the Prison Keepers. They keep weird things out of the 'door' and capture and contain weird creatures that come into the world. Lu Xiao accidentally fell into the dark prison and lived alone in the dark prison for three years. When he was discovered by the Prison Guard organization, he was already crazy! ! !