Serment - Contract with a Devil (or Serment, for short) is a visual novel - dungeon crawler hybrid where you play as a girl who was revived by a beautiful devil. Though, instead of claiming our heroine's ever so cliche human soul, the devil demands a huge sum of money for payment. If the payment comes even one day late, the heroine's soul will return to the afterlife.
And so, her light-hearted, comedic adventure to save up enough money before the deadline begins.
Despite the dark sounding premise, the majority of Serment will be light-hearted slice of life events (more commonly known as cute girls doing cute things).