In 1742 in Venice, the young Giacomo Casanova is in a great trouble. A few years previously, in the seminary in Padua, Giacomo had experienced his first love, though he was destined to be a priest. While Giacomo now follows the seminary, the young noble is to sneak into a palace of beautiful girls and spend the night. One day, Giacomo falls in love with a beautiful countess, so he decides to abandon his studies to become a priest for being a daring libertine.