Where does “isekai” come from?

isekai (English) comes from Japanese 異世界, from Japanese 世界, from Middle Chinese 世界.

isekai (English): A genre of Japanese fiction involving everyday people transported to alternative fantasy or virtual worlds

Definitions

  1. A genre of Japanese fiction involving everyday people transported to alternative fantasy or virtual worlds

Ancestry of “isekai”, step by step

StepLanguageWordMeaning
1Japanese異世界another world
2Japanese世界the world; a metaphorical world; society, the...
3Middle Chinese世界—
Every word from Middle Chinese 世界 →Every word from Japanese 世界 →Every word from Japanese 異世界 →