There is a fan made manga with a OPM x Dragonball crossover.
You can find links to them here: https://www.reddit.com/r/OnePunchMan/com...punch_man/
If you will read only one, I'd suggest the volume 1 chapter 2
You can find links to them here: https://www.reddit.com/r/OnePunchMan/com...punch_man/
If you will read only one, I'd suggest the volume 1 chapter 2