1976, Chongqing, 14-year old Dou was in hospital. He falls in love with a pretty nurse, Jiahui. Jiahui belongs to Gang, a mobster, who is brutal to her. Dou is becoming Jiahui’s protector, her Moonlight Warrior, but Jiahui and Gang leave for Japan. 20 years later, Jiahui returns to China, Dou recalls his childhood dream.

影片根据虹影同名长篇小说改编，以重庆“山城”为地理背景，讲述了在1976年，12 岁少年窦小明因受伤进了医院，认识了对他照顾和关爱有加的护士佳惠。佳惠生得美貌，却嫁给当地混社会的青年钢哥，常常遭受家暴。窦小明得知此事后站出来打抱不平，从此改变了他们三人的命运。