Inwai na Shinryakusha

At first there was a squirrel. To be precise, it is a deformed squirrel-like creature. The squirrel clung to the strange creature and shook its hips in a frenzy. After a few years, the squirrels disappeared from the forest. This time it was rabbits and then domestic sheep, and the incident gradually expanded in scale. In a nearby village there are rumors that these strange creatures "disguised themselves as attractive females to lure and prey on males". The villagers raised funds and asked the protagonist, an adventurer from the guild, to exterminate the monsters.