The standalone One Piece special, 3D2Y: Overcoming Ace's Death! Luffy's Pledge to His Friends, has arrived on Crunchyroll, complete with English dub and subtitle options. This 2014 TV special offers a focused look at Monkey D. Luffy's crucial two-year training period on Rusukaina island.

Produced by Toei Animation, the studio behind the long-running One Piece series, the special delves into Luffy's personal growth following the devastating loss of his brother Ace at Marineford. Stranded on a dangerous island filled with monstrous beasts, Luffy dedicates himself to mastering Haki, the spiritual energy that enhances combat abilities, in preparation for the Straw Hat Grand Fleet's reunion.

While primarily a training montage, the narrative is punctuated by the abduction of Sandersonia and Marigold, sisters of Boa Hancock. This event forces Luffy to test his newfound powers and resolve, offering a compact adventure that highlights his determination to become stronger for his crew. The special is a self-contained story, offering a distinct narrative arc separate from the main manga and anime continuity.

With a MyAnimeList score of 7.84 from over 61,000 voters, 3D2Y is a well-regarded entry for fans seeking to explore specific moments in Luffy's journey. It provides a valuable glimpse into the character's development during a pivotal, albeit non-canonical, period between major story arcs.