You've just been isekai'd from the human world to the elf world. You've been summoned to an all-female elf village with one intend from them. They intend for you to breed with all the elf girls there to repopulate their village and maintain a stable birth-rate. And best of all, the elf girls here are all virgins with little-to-no knowledge of sex.

This is an otaku's perfect fantasy...