性爱微积分

　　晴朗的一天，三年前痛失男友的珍娜（丝柯·泰勒-考普顿 Scout Taylor-Compton 饰）与好友瑞妮（克里斯蒂娜·尤罗尔 Christina Ulloa 饰）、迈克（迈克尔·科彭 Michael Copon 饰）以及新结识的帅气青年伊安（特拉维斯·范·文克 Travis Van Winkle 饰）前往某个乡村，参加当地举行的五月节。湖畔小屋，笑语欢歌，青年男女们纵情欢乐，只有珍娜强颜欢笑，似乎久久无法从三年前的惨剧中走出。随着夜幕降临，四人走入桑拿室，体会无上的蒸汽享受，而危机也正一步步向他们迫近。在此期间，迈克和瑞妮突然爆发争吵，前者夺门而出，大发雷霆，而瑞妮和珍娜、伊安稍后却发现，他们三人却被意外锁在桑拿室中。　　温度逐渐升高，而死神的脚步越来越近……

　　The nightmare was about a demonic possession. A long time ago, there was an evil in a small town and it was jealous of the girl and would never let her go, since the devil loved the girl. One night, the evil raped the girl and she became pregnant. After months the girl could not hide her baby, her father figured her secret out and clapped the girl in irons and locked her room door. But the evil put the gun to her father' temple and saved the girl. The father had a stroke and had been sleeping on the bed for three months and died. Time went on and the girl brought a child into the world. Naturally, people who were living in the village heard the story and they did not want to see neither the girl nor the baby since when the baby was born, plants dried in the field, fishes lost in the lake and people had prayed to the god for rain, but nothing changed in the village. People got so angry, dug a hole in front of the fountain, put her into the hole and threw stones at her face. The girl died soon after. The evil went off the deep end, took a revenge of the village and killed everyone except two sisters because the evil wanted them to take care of its baby...

电影主要讲述了睿智沉稳的徐文轩、外表文静秀美但性格反叛火爆的白若雪，与伪君子海石在游戏世界相遇相识后，在现实世界里产生纠葛的爱情故事。

　　影片是一部围绕约会匹配软件展开的原创悬疑片，恋爱方面晚熟的婚礼策划人轮花（土屋太凤 饰）被同事推荐了配对APP，虽然和一位男士匹配成功，但是出现在约会中的他却和照片完全不一样。与此同时，发生了针对APP用户的连环杀人事件，事件朝着意料之外的方向发展，魔爪也渐渐逼近了轮花...佐久间大介饰演与主人公·轮花相遇，纠缠不休的跟踪狂·永山吐梦。