Tokumori-san is a young woman with long green hair, characteristically worn in a ponytail. She consistently appears in a convenience store uniform featuring a collared button-up shirt and a striped zip-up vest. Her adult physical form shares the prominent bust size common among female characters in her series.

Originally depicted as a shy, flat-chested middle school student, Tokumori-san undergoes a significant physical transformation observed later by a viewpoint character. This developed figure becomes a defining trait of her adult presentation. Within the story, she works at a minimarket.

Across the progression of official media, including illustrations and adaptations, Tokumori-san transitions from a background figure to a recurring cast member. This evolution integrates her more fully into the interconnected lives of other characters, reflecting the series' gradual expansion beyond its initial focus. Her development consistently follows this trajectory of increased presence and physical maturation.