"Old Boy" is a psychological thriller manga written by Garon Tsuchiya and illustrated by Nobuaki Minegishi. The narrative centers on Goto Mitsuo, a man who is inexplicably kidnapped and imprisoned in a private, windowless cell for ten years without explanation. During his confinement, he is provided with basic necessities but no contact with the outside world. To maintain his sanity, Goto trains rigorously, honing his physical and mental strength, and plots his revenge against his unknown captors.

After a decade, Goto is abruptly released, finding himself in a Tokyo rooftop garden with no explanation. He is given a cell phone, money, and a clue: he must discover the identity of his captor within five days or risk losing the woman he loves. Determined to uncover the truth, Goto embarks on a relentless quest for answers, navigating a labyrinth of deception, violence, and psychological manipulation. His investigation leads him to confront figures from his past, including a former classmate, Eri, and a powerful businessman, Daimonji, who may hold the key to his imprisonment.

As Goto delves deeper, he uncovers a web of secrets tied to a tragic incident from his youth, involving betrayal, jealousy, and unresolved guilt. The story explores themes of vengeance, redemption, and the consequences of one's actions, as Goto's pursuit of justice becomes increasingly intertwined with his own moral dilemmas. The narrative is marked by its intense pacing, intricate plot twists, and exploration of the human psyche under extreme duress.

The characters are complex and morally ambiguous, with Goto's transformation from a victim to a determined avenger serving as the emotional core of the story. His interactions with other key figures, such as Eri and Daimonji, reveal layers of personal and societal conflict, adding depth to the overarching mystery. The manga's stark, gritty artwork complements its dark tone, emphasizing the psychological and physical toll of Goto's journey.

"Old Boy" is a gripping tale of revenge and self-discovery, blending suspense, action, and emotional depth to create a compelling narrative that challenges conventional notions of justice and morality.