Chie serves as Hiroki Hirose's younger sister in "Chuck Shimezō." She joins Hiroki and Shimezou when they leave home, becoming part of the central trio on their journey to their grandfather's house. Hiroki must bring her along as an unwanted responsibility, initially wishing to leave her behind.

Chie participates fully in the group's adventures and challenges. Her persistent presence adds to Hiroki's burdens, fueling his motivation to run away, despite his initial resistance.

Her background establishes her place in the Hirose household, with Hiroki as her older brother and an unnamed mother and grandmother. Her role stems from being the younger sibling drawn into the main characters' plans.

Following the journey, Chie returns home with Hiroki and Shimezou. The story's resolution sees both children reconciling with their mother, mirroring Shimezou's own family reconciliation, concluding her documented arc.