Cover Page, One Piece Wiki

Not to be confused with Page One.. The Cover or Title pages (more commonly called Door (扉, Tobira?) pages in Japan) of each manga chapter depict that chapter's title and number, together with a full-page illustration. These pages come in several different categories, each tied to a specific type of illustration; most notable are the so-called Cover Arcs, which are considered fully canon with the manga's storyline. So far, only three chapters have lacked specific cover pages: Chapter 4, Chapter 6

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Cover Page, One Piece Wiki, Fandom

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One Piece Wiki