The team responsible for the anime Isekai Ojisan released its opening sequence last Saturday.
Check it out:
Isekai Ojisan will premiere worldwide on Netflix on July 6th.
Synopsis:
The story takes place in 2017 with Takafumi going to the hospital to visit his uncle, who has just woken up from a seventeen-year coma. However, it seems he has lost his mind, as he claims to have been in another world called "Grand Bahamar" all this time, and even seems to speak a strange language. But everything changes when his uncle, an ordinary human, shows him that he learned to use magic in the other world.
So, when Takafumi realizes that the magic his uncle uses is completely real, he proposes that he use his abilities to become a successful YouTuber. Now taking care of him, Takafumi and his uncle begin to get involved in the streaming life, while his uncle occasionally tells him about his life in the other world.
Finally, the author Hotondo Shindeiru has been publishing the manga Isekai Ojisan through Kadokawa 's ComicWalker since June 2018.
Source: ANN

