Several young couples travel to a private island for a mysterious training retreat that promises to strengthen their relationship. However, during the Retreat, the heroes encounter an ancient demon - a Succubus. This monster feeds on the life energy of people, taking on someone else's appearance and provoking victims to show the worst qualities and do terrible things.
Who is lovesick these days? A young journalist wants to expose the charming founder of a lovesick agency as a fake and embarks on a search for his own lost ability to love.