Non-canon is material that does not appear as part of the original One Piece manga written by Eiichiro Oda, including all spin offs and adaptations of the source material. Although the One Piece anime generally adapts the canon story line very closely, there are also significant deviations such as adding additional story arcs. These non-canon anime arcs are often known as , as they are not usually regarded as relevant to the overall plot of the series.