Chihiro Asaoka is a young woman with brown hair and brown eyes, standing 1.60 meters tall and possessing an 82-58-85 figure. Her birthday falls on August 29, and she has blood type A.

She reconnects with Masato Fukuroi during a summer hotel job, rekindling a high school acquaintance. Their relationship deepens romantically, culminating in an intimate encounter before summer's end.

Working at a fast-food restaurant come autumn, Chihiro continues seeing Masato. She invites him to a rock concert, unaware he simultaneously arranges an outing with another woman, Rei. This clash underscores her expectation of commitment against Masato's pursuit of multiple relationships. Her emotional investment emerges further through dreams of intimacy with him during separations.

By winter, Chihiro grows distressed upon discovering Masato's ongoing involvements, including a physical encounter with another partner. Her opposition to his infidelity highlights her desire for exclusivity, though their relationship's resolution remains ambiguous within the depicted timeline.

Her character development navigates romantic expectations and conflict with Masato across summer, autumn, and winter seasons.