Every great infiltration story builds toward the "unmasking" or the "heist turn." The moment when the investigator drops their cover and reveals their true allegiance is a narrative dopamine hit. In "best" class stories, this reveal is multi-layered.
Secret Mission: Sennyuu Sousakan wa Zettai ni Makenai! (also known as Secret Mission: Undercover Agents Never Back Down! secret mission sennyuu sousakan wa zettai ni ma best