On a trip to a hot spring with three male friends, they discover AIKA hitchhiking in a remote mountain area blanketed in snow—an oddly gorgeous woman who seems out of place. Though slightly suspicious, their lust gets the better of them and they offer her a ride. As the mood inside the car grows lively, they begin to sense something strange about AIKA's behavior. When she offers to repay them with sex, they happily accept, thinking they've hit the jackpot—only to realize too late that the situation is spiraling out of control. Hidden beneath AIKA's beauty is a dark secret no one ever saw coming…