"One More Day" is a four-part, 2007 comic book crossover storyline, connecting the three main Spider-Man series concurrently published by Marvel Comics at the time. Written by J. Michael Straczynski and Joe Quesada, with art by Quesada, this story arc concludes the fallout of Spider-Man's actions during the 2007 Civil War crossover.
One More Day starts in Amazing Spider-Man #544, continues in Friendly Neighborhood Spider-Man #24 and The Sensational Spider-Man (vol. 2) #41, and concludes in Amazing Spider-Man #545. After his Aunt May has been shot, Spider-Man seeks help to save her life.
He encounters the demon Mephisto, who offers to save her life if Spider-Man gives him his marriage. Spider-Man and his wife Mary Jane Watson agree, and this part of their history is erased so that, effectively, they have never been married. The storyline set the stage for a restructuring of the Spider-Man titles, resulting in the cancellation of Friendly Neighborhood Spider-Man and The Sensational Spider-Man, with Amazing Spider-Man revamped as a thrice-monthly publication.
The decision to abruptly end Peter Parker and Mary Jane's marriage and the events of "One More Day" were heavily criticized upon the series' conclusion, although the artwork received praise.