Reincarnated: I Keep Goddesses in My Goblin Lair

[Otherworld] [Villain] [Goblin] [Dark] [Harem] [Not an Invincible Protagonist] Reborn as the lowest-ranking monster, a goblin, and his nest is about to be overrun from the start? He activates the Goddess's Nest System: a valiant female captain of the Imperial Guard, known as the Empire's Sword; a cold and aloof female elven hunter of the forest; a great mage from the tower... They all fell into depravity in the goblin lair. Starting as an ordinary goblin, he evolves into a greater goblin, a goblin warrior, a goblin priest...