After repeated military losses, the king of Aliahan makes a deal with the Demon Army: he will let them capture the Hero and in return they will spare his kingdom. According to this deal, the entire Hero party is restrained and teleported to Demon Army’s HQ. There, they will be made to give birth to enough monsters to replenish all that were lost in the war. The Hero herself gets picked as a mate by a particularly big, strong and violent troll...