Kiss of Sin is a fully voiced adult dark fantasy game about a proud and haughty aristocrat named Ariette, who cannot be broken by simple seduction techniques. If you were to meet Ariette in the flesh, she would most likely introduce you to her sword!

She craves power, is a masterful swordswoman, and despises weakness.

One day, she comes into possession of a forbidden ring that has the power to rewind time. However, each rewind comes at a price: the ring feeds on sexual energy, and each easy choice only makes the next rewind more expensive.

Magic has all but disappeared from this world, giving way to science.

The crown's power is weakening, and the guilds along with the Inquisition are vying for power, using order as a cover and fueling fear of long-forgotten magic in the rebellious port city of Havenport. The city is engulfed in political intrigue, betrayal, greed, and vice, while a bigger evil lurks in the shadows - a succubus attempting to open a portal to her demonic realm.

She lacks the magic to see her plan to completion, and Ariette may be the missing link to that end.

When Ariette's uncle offers her the position of royal magistrate in Havenport, she sees it as an opportunity to strengthen her position, gain recognition for her lineage, and take the first step toward donning the crown. However, her plans are disrupted when the Inquisition takes notice of her, her coin purse is empty, and the secret of her blood proves to be more dangerous than palace intrigues. The succubus is unable to corrupt Ariette through conventional means, such as sex and seduction. Ariette possesses a hidden power that she herself is unaware of. And so the demon takes a different approach - turning Ariette's pride and thirst for power against her, gradually leading her to become addicted to the forbidden demonic magic.