The first episode introduces Pico, a young boy working at his grandfather's café during the summer, and Mokkun, an older man who encounters him. The episode establishes the visual style and themes of the series.
The story revolves around Pico, a young girl who gets involved in a mysterious and somewhat sinister plot. The series explores themes of identity, human psychology, and the consequences of actions. Due to its nature, the plot is somewhat complex and open to interpretation.