What is Isekai?

Isekai means 'another world' in Japanese and refers to stories where a character is transported to a fantasy world. In hentai, isekai settings provide convenient scenarios for harem situations, fantasy races (elves, demon girls), and power fantasies. Popular hentai isekai titles include Isekai Harem Monogatari and Youkoso! Sukebe Elf no Mori e. The genre's popularity in mainstream anime has directly boosted its presence in hentai.