Film's writer Bob Gale would have supervised series, now dropped due to rights issues

Manga artist Yuusuke Murata (One Punch Man, Eyeshield 21) reported on Twitter this weekend that his manga adaptation of the 1985 American science-fiction film Back to the Future has been cancelled. Murata explained that the Kono Manga ga Sugoi! Web site's editors did all they could, but they could not resolve the rights issues for several elements that would have appeared in the manga.

Murata also posted images from part of his uncompleted draft:

He previously posted a rough draft for the above image of Marty McFly, Emmett Brown, and the dog Einstein with the DeLorean time machine, along with his rendition of a "monster truck DeLorean":

Murata announced the manga at the Ready Player One film "celebration event" in Tokyo in February. The Back to the Future film's screenwriter Bob Gale would have supervised the manga, which would have include story content not seen in the film. They had planned to publish the first compiled book volume on April 20. Although Kono Manga ga Sugoi! Web described the manga as based on the 1985 film, the preview illustration also featured characters from the film's two sequels:

Robert Zemeckis directed the film, which follows Marty McFly, a high school student living in Hill Valley, California in 1985. During an interupted experiment with his scientist mentor Emmett Brown, Marty travels back in time 30 years ago to 1955. After he meets his future father and mother, he must restore the past and return to the future.

Viz Media released all 37 volumes of Murata and Riichirou Inagaki's Eyeshield 21 manga in North America. The manga inspired a 145-episode television anime series in 2005-2008, and Sentai Filmworks released the series on home video in 2010-2011. Crunchyroll is streaming the series online.

After Eyeshield 21, Murata and web manga creator ONE launched the ongoing One-Punch Man manga on Shueisha's free "Tonari no Young Jump" website in 2012. The series is a remake of ONE's original web manga of the same name. Viz Media is releasing the series digitally in its Weekly Shonen Jump manga anthology, and is also releasing the series in print. The manga also inspired a television anime which Viz Media streamed as it aired in Japan. The anime's staff announced a second television season which will premiere next April.

Source: Yuusuke Murata's Twitter account