In a world where everyone is granted a [Skill] by the Creator God, the skill given to the eldest son of a noble, Alto, was [God Gacha], which required a hefty fee to summon monsters. While his father was furious at him for having a dud skill, Alto staked his own exile, using all his assets to spin the gacha... However, what was summoned was not a monster, but a beautiful girl named Rudia, who claims to be the Goddess of Fertility.