Shinkaku Senki Age Slave ~Inmon ni Ochiru Elf Shimai~

The Elfin Empire, where elves and humans live together, is ruled by the high elves and surrounded by a deep forest. Goblin tribe, led by a shaman Zodom, attacks the country with their mechanical beasts and the princesses are bestowed with new powers to defend the nation. However, years later, the cardinal Gedlf conspires to take over the kingdom and makes a deal with goblins to make the noble elf princesses his own using immoral means. The princesses are marked with a curse that turns their bodies into lustful beings, losing their divine powers and becoming slaves.