A female highschool teacher must deal with sexual harrassment from her students and being trapped in a love triangle with two men, neither of whom has any interest in marrying her.

一名生性冷感的职业杀手，杀人手法乾净俐落，从不留下任何痕迹。然而，在某次的执行任务时，过程却被一位患有自闭症的清纯少女所目睹，於是上级下令要他杀人灭口，但每回只要一与她接触，他便下不了手，只因少女身上有种特殊气质，令他心动莫名。究竟是怎样的柔情，融化了杀手冰冷的心....