One Piece Episode 483, " Looking for the Answer! Fire Fist Ace Dies on the Battlefield! ", is a deeply emotional installment marking the end of the Marineford Arc, where Portgas D. Ace sacrifices himself to save Luffy. After sustaining a fatal blow from Admiral Akainu, Ace shares his final thoughts, thanking his loved ones for the life he lived, and dies in Luffy's arms, plunging his brother into a profound, catatonic state of grief. This critical episode is available to stream on platforms like Crunchyroll and Netflix.