It's turn based and occurs on a combat grid. Each character has the usual options of moving, attacking, spell casting, and using special skills, like martial arts or whatever. Some skills like magic use are expensive, and others like knowing history are not. Strength, Will and Agility. Each character also has a certain number of Action Points based on their stats.
Characters have normal, severe, or extreme levels of susceptibility to each vice.
On an adventure in a pub, your warrior encounters a beautiful woman that takes an interest in him and wants to discuss her plight in a more secluded location. Right now, without any of his fellow party members tagging along. Also, the magic system is based on the vices. You have to explain that one. There are six schools of magic founded on the six vices, and each has spells that reflect these vices.