Hitoshi Tadano, the Extraordinary Undercover Detective(2003)

Hitoshi Tadano, the Extraordinary Undercover Detective is a series following an advertisement company's seemingly worthless assistant manager who hides a secret life. To his coworkers, Hitoshi appears passive and incompetent—a puzzle to everyone wondering why he hasn't been fired. Only the CEO knows the truth: Hitoshi is a skilled operative running covert missions to root out corruption within the company. His bumbling public persona masks an extraordinary operative working in the shadows. As Hitoshi balances his cover as a nobody with dangerous undercover assignments, he becomes the CEO's most trusted asset. The series blends workplace comedy with corporate intrigue, exploring themes of loyalty, hidden identities, and the power of operating unseen. What unfolds is a clever cat-and-mouse game where the company's salvation depends on the man everyone overlooks.