One-Punch Man artist Yuusuke Murata tweeted the bad news,

Basically, despite Bob Gale the writer of Back To The Future agreeing to supervise a manga adaptation of the movie by Yuusuke Murata, and the project being announced at a Ready Player One film "celebration event" in Tokyo in February, the project has now been abandoned due to, well, no one actually being able to get the rights to publish it. Or specifically, as Anime News Network reported, unable to clear aspects that would have appeared in it.

Say, IDW Entertainment, you have the rights for English language Back To The Future comic books, what do you say? Look, he's even drawn a monster truck DeLorean…