A fun manga that I found
MC is a speedrunner that got isekai'd into the world of the game he played. As soon as he reached the isekai, he immediately speedrun thinking he's in a lucid dream. And he managed to defeat the Demon King in only 30 minutes since his summoning. But... I'll leave the rest for you to read.
https://mangadex.org/title/ac743453-99ef-49e5-93e5-265cfff01fe0/rta-sousha-wa-game-sekai-kara-kaerenaiOpen linkView original on lemmy.world
Hah this is gold! It doesn't seem like a purely gag manga either. I'm excited to see where this goes.