Ayako, a young female assassin, stares at the fish tank in her bedroom. Smoothly a song comes through the wall as played from the room. She got to live next door with a harmonica player although they never met each other. As soon as she hears the song she feels dragged by the sound and moves towards the wall where she leans, slides down the door, and gets serenade by the tune. Jessie, a male adult harmonica player, lives by himself in an open space apartment where he plays for long part of the day. All of a sudden someone knocks at Ayako’s house door. She wakes up, open a drawer, quickly steps toward the door, she grabs a greeting card which has a name and an address written on it. Ayako walks down different places of the city until she reaches a railways station where she killed her first victim. Meanwhile Jessie spends his time staring at the city from the rooftop of a parking structure where daily he goes. Eventually Ayako and Jessie meet by chance in a bar and Jessie explain that he was a killer once but he made a mistake. He didn’t kill somebody whom he followed in love with and since that moment he had to hide himself from the mob. On the rooftop of the parking building Ayako is about to kill Jessie but she gives up when he stars playing the tune familiar to Ayako. She ends up making his same mistake.