In Bound by Lust you play as a young man ready to begin his life anew in the big city. Enjoy your new student life, increase your stats, build strong relationships with a vast cast of characters and discover the mysterious appearance of a strange blue demon girl.
Long time ago humans and succubi lived in harmony, humans being week needed the magical help of those creatures to rise monumental structures like pyramids and temples, but in exchange, they needed to provide power to those creature by mating with them. The seed it's their source of magic and humans are it's catalyst and to swore fidelity to them, but not all humans were the same, some of them were able to give more power than others, those people were called Guardians so to ensure balance and safety, the succubi created contracts that were used to bond spiritually a human and a succubus with the respective capabilities. But a powerful succubus named Madhava couldn't stand the limitation of those contracts...