Koko ga Tanetsuke Frontier  

This Is The Mating Frontier!, ここが種付けフロンティア

After spending several days searching for treasure, Lang finally spots a village in the distance. However, upon collapsing from exhaustion, he wakes up next to an elf woman named Heina, who had found him and tended to his wounds while he slept. To his surprise, he discovers that the entire village is inhabited by women, and Heina informs him that this is an elf mating village-a place where elf women go every 50 years to strengthen their bloodlines by mating with other races. Now, Heina wants Lang to select three women to mate with.