The story of Takafumi’s uncle is told in the series Uncle From Another World. Because of an episode from a while ago, Takafumi’s Uncle has been going into a trance-like state.
At the time of this writing, it appears that Uncle From Another World will be only available through Netflix.
On IMDb, the anime has a good rating of 7.4/10, and on MyAnimeList, the average rating is 7.27.
Uncle From Another World is a manga series written by Hotondoshindeiru and put out by Kadokawa Shoten.