Uncle from Another World

Uncle from Another World is also listed as Isekai Oji-san on some trackers — same show, different title convention. Atelier Pontdarc is the animation studio behind this TV series across 13 episodes. It's finished airing, so the whole thing is watchable start to finish.

It's filed here as Adventure, Comedy, and Fantasy, which is usually the fastest way people find it while browsing by genre. If Uncle from Another World works for you, No Game, No Life and KONOSUBA -God's blessing on this wonderful world! are close matches — see the full related list below.