What do you want for the 35-year anniversary?

[Anaraxes]

Originally Posted by RedMattis

Nah, {Isekai} it has been around for ages

It isn't a new trope, the "anime" people just gave it a name.

Originally Posted by Say, it isn't that bad!

"Cross-worlds fiction".

"Portal fantasy" is pretty commonly used in the industry, at least in this millenium. Goes back to "Alice in Wonderland" at the very least in its modern form, whatever the sub-genre is called. Thomas the Rhymer goes back to the 1400s. You can decide if you want to count more ancient stories like sailing to another of the Nine Worlds in Norse mythology, or Orpheus visiting the underworld in Greek.