Many of the stories are written in a non-chronological order, revealing different parts of the narrative at different times. For example, Ogami's betrayal is not revealed until the end of the first volume, after many stories have already passed. Koike stated in an interview that he crafted the comic to be based upon the characters themselves and that the "essential tension between [ Ittō's ] imperative to meet these challenges while keeping his son with him on the journey" drove the story. According to Koike, "Having two characters as foils of each other is what sets things in motion" and that "If you have a strong character, the storyline will develop naturally, on its own." When "Lone Wolf and Cub" was first released in Japan in 1970, it became wildly popular (some 8 million copies were sold in Japan) for its powerful, epic samurai story and its stark and gruesome depiction of violence during Tokugawa era Japan. "Lone Wolf and Cub" is one of the most highly regarded manga due to its epic scope, detailed historical accuracy, masterful artwork and nostalgic recollection of the bushido ethos. The story spans 28 volumes of manga, with over 300 pages each (totaling over 8,700 pages in all). Many of the panels of the series are depictions of nature, historical locations in Japan and traditional activities. "Lone Wolf and Cub" was initially released in North America in a translated English edition by First Comics in 1987, as a series of monthly, comic-book-sized, square-bound black-and-white comics containing between 64 and 128 pages, featuring covers by Frank Miller, and later by Bill Sienkiewicz, Matt Wagner, Mike Ploog, and Ray Lago. Sales were initially strong, but fell sharply as the company went into a general decline. First Comics shut down in 1991 without completing the series, publishing less than a third of the total series over 45 issues. Starting in September 2000, Dark Horse Comics began to release an English translation of the full series in 28 smaller-sized trade paperback volumes with longer page-counts (from 260 to over 300 pages), similar to the volumes published in Japan. Dark Horse completed presentation of the entire series, fully translated, with the publication of the 28th volume in December 2002. Dark Horse reused all of Miller's covers from the First Comics edition, as well as several done by Sienkiewicz, and commissioned Wagner, Guy Davis, and Vince Locke to produce new covers for several volumes of the collections.