Ryuuji, our story's protagonist, is returning to his old home village together with his twin little sister after several years. In the past, he was really popular with the girls his age as he was the village's only boy... So, unlike his unpopular life in city, he was full of hope. However when he arrives home the girls have moved on and no longer like him very much.

Complicating the situation, the adult villagers make a crazy demand. The village's population is dwindling and will soon be gone. To save it, he must make all the girls pregnant and none can refuse him. His harem impregnation life begins now!