More than half of the borrowed words relate to cooking, while Kintsugi, the increasingly popular art of repairing broken pottery with gold lacquer is also included
It's official. You're not an otaku nerd anymore if you say Isekai but someone with an extensive vocabulary. Don't let anyone tell you anything else!
There are Scrabble dictionaries, but they're mostly for convenience.
The actual rule is that you can use any word that appears in a standard English dictionary, except for suffixes, prefixes, abbreviations, or anything that requires a hyphen, apostrophe, or capital letter.
As the other users have mentioned, its a genre about going to another world, and its real big in Japan right now, but you're definitely familiar with it in some form.
After all, The Lion, Witch and the Wardrobe is technically Isekai.
Its actually really fun to look back and figure out what classic things are.
Isekai, a Japanese genre of fantasy fiction involving a character being transported to or reincarnated in a different, strange, or unfamiliar world, also made the OED.
"Isekai" is "another world". Everything else is debatable.
Some are rather strict on isekai being a trope: the protagonist of the work is transported or reincarnated into another world. Some however see it as a genre, defined by the presence of the trope and potentially additional factors (such as resemblance to other isekai works).