On the official site for the manga written and illustrated by Shindeiru Hotondo, Isekai Ojisan, the work was reported to have surpassed one million cumulative circulating copies in the four compilation volumes published to date.
Hotondo began publishing the manga on Kadokawa publisher's ComicWalker website in June 2018. The publisher published the fourth compiled volume on April 23, and will publish the fifth on October 23.
Synopsis of Isekai Ojisan
Takafumi's uncle was in a coma for a total of seventeen years after being hit by a truck. However, one day he woke up and told Takafumi that all this time he had been in another world. Of course, he never took it seriously, until his uncle tells him that there he learned to use magic and ... he can really use it!
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