Shueisha's Shonen Jump + web manga site published a spinoff manga of Akira Toriyama's Dragon Ball manga on Monday titled Dragon Ball Gaiden: Tensei Shitara Yamcha Datta Ken (Dragon Ball Side Story: The Case of Being Reincarnated as Yamcha). Dragon Garow Lee drew the manga, and Toriyama is credited for the original work.

In the manga, a high school boy gets into an accident by falling down a stair, and reincarnates in the Dragon Ball world as Yamcha. Armed only with his knowledge of the later events in the comic, he sets out to make Yamcha the hero of the story.