The Masked Chosen Survivor

Chosen Contestant enters Horror Realm. Mission: re-enter abandoned high school as student, recreate events, survive 5 days. School suffered bizarre incident; students and investigators vanished. Nightmare-tier Horror Scenario caused millions of deaths. Protagonist gains Masquerade Talent, title Family-Abandoning Scoundrel, trait Condemned by All; those wronged by him devoted to System Host. Dragon Realm military observes, prepared to use Forbidden Artifacts.