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Akira Toriyama’s Dragon Ball inspired Dragon Garow Lee to write the spin-off Dragon Ball Side Story: The Case of Being Reincarnated as Yamcha (Dragon Ball Gaiden: Tensei-shitara Yamcha Datta Ken). The continuation of the story was published in Shonen Jump+ on 8 May 2017.
The side story is about a boy who loves Dragon Ball and one day falls down the stairs. But when he opens his eyes, he is in the world of Dragon Ball and in the body of Yamcha. A year after the Saiyan attack, he visits Namek to become even stronger.
The next part of the story will come out this summer. The first part was released on the online manga magazine Shonen Jump+ in December 2016, so be sure to check it out if you can.