艾米尔（香侬·惠利 Shannon Whirry 饰）不仅长得美艳动人，更拥有一副与相貌相匹配的高智商大脑，一直以来的富裕生活让艾米尔坚信，女人也是可以自力更生的，为此，她还进行了一场精彩绝伦的演讲。可是，在此之后，人们便失去了艾米尔的消息，原来，她被一位名叫理查德（Michael Christian 饰）的神秘男子绑架了。 理查德将艾米尔软禁在了密室之中，他的真实身份究竟是谁，想要得到什么，艾米尔一无所知，她只是每日如同“洗脑”一般被灌输着各种各样的奇怪思想，很显然，理查德想要通过这样的方式来改造艾米尔的思维。凭借着自己的聪明才智，艾米尔逃脱了理查德的禁锢，可是故事并没有就此结束，聪明的艾米尔决定以其人之道还治其人之身，让理查德也尝一尝被软禁的滋味。
This long-lost masterpiece of hardcore gay erotic cinema centers on a handsome young stud who rides his motorcycle through myriad sexual encounters, from a soccer game’s locker room to a phantasmagoric and deeply melancholy orgy. A labyrinth of all-male fantasies whose outstanding beauties always end up fading away while leaving their sensual protagonist dealing with his own loneliness, EQUATION was directed with supreme grace by the mysterious Dietrich de Velsa (aka Francis Savel/Frantz Salieri). A former painter, de Velsa was also the owner and artistic director of La Grande Eugène, one of the first drag cabarets in Paris. Years later, he collaborated with Joseph Losey on MR. KLEIN (1976) and DON GIOVANNI (1979). His one and only film, EQUATION TO AN UNKNOWN stands as one of the most extraordinary erotic films of all time. “The most melancholic porn film I’ve ever seen. It’s very sad, and aesthetically beautiful. Just a young man wandering through several depictions of love and choreographies of love-making it’s like a ceremony, a ceremony of fantasies, especially the last sequence where the main character recalls all his previous fantasies, which come one by one around his bed and make love to him. I think it’s one of the most beautiful film sequences of French cinema.” –Yann Gonzalez
内心怀抱着难以治愈的伤痛，宛如浮萍在人间漂泊的友里（濑户果步饰)，最后选在一间小小的旧书店落脚，并且嫁给了该书店的老板阿友（宇野祥平饰），成了旧书店的老板娘。阿友虽然对因车祸过世的前妻念念不忘，却在生活上十分依赖友里。另一方面，与阿友从小就相识的隆太发现了过世的父亲遗留下来的诗集，因此契机让他和友里在不知不觉中相互吸引，进而坠入了爱河。友里若想与隆太持续下去，就代表着她必须要离开阿友，这段纠结的三角关系也让他们的生活产生了变化……
