"Final Boss Fake-out" centers on a protagonist who finds themselves thrust into the role of the final boss in a fantasy world, a position they never sought or desired. The story begins with the protagonist, an ordinary individual, suddenly transported into a game-like realm where they are identified as the ultimate antagonist destined to be defeated by the hero. However, the protagonist lacks the typical villainous traits or ambitions associated with such a role, leading to a series of comedic and dramatic misunderstandings.

The narrative explores the protagonist’s attempts to navigate their newfound identity while avoiding confrontation with the hero and other adventurers. Despite their efforts to remain inconspicuous, their actions are often misinterpreted as grand, villainous schemes, further cementing their reputation as the final boss. The protagonist’s interactions with other characters, including the hero, allies, and rival factions, drive much of the plot, creating a blend of humor, tension, and unexpected alliances.

Key characters include the hero, who is determined to fulfill their destiny by defeating the final boss, and a cast of supporting figures who either aid or hinder the protagonist’s attempts to escape their fate. The story delves into themes of identity, fate, and the consequences of perception, as the protagonist struggles to reconcile their true self with the role they are forced to play. The manga balances lighthearted moments with deeper explorations of the protagonist’s internal conflict, offering a unique twist on the isekai and fantasy genres.