bbbSeveralyoungcouplestraveltoaprivateislandforamysterioustrainingretreatthatpromisestostrengthentheirrelationship.However,duringtheRetreat,theheroesencounteranancientdemon-aSuccubus.Thismonsterfeedsonthelifeenergyofpeople,takingonsomeoneelse'sappearanceandprovokingvictimstoshowtheworstqualitiesanddoterriblethings.