I can't believe it took this long into the isekai manga trend for someone to think "what would happen if one of these doofus actually came back to the real world?"
UNCLE FROM ANOTHER WORLD (Isekai Oji-san), by Hotondoshindeiru. First published in 2018 and first published in North America in 2021.
PLOT:
In the year 2000, Takafumi's uncle was hit by a truck. He spent the next 17 years in a coma. Now Takafumi is stuck with a middle-aged Sega otaku who claims that he spent that time in another world, one full of magic, cute girls, and adventure. Takafumi is skeptical, but what if his uncle was telling the truth?
