Airu is a central character in the episode titled "Wait, I'll Be There." She is a bright and energetic girl who travels across a frozen, post-apocalyptic world. Her primary mission is to journey across the land to make flowers bloom, utilizing a special substance known as magic sand. This magic sand was left to her by her mother, Dr. Aira, who was a botanist. Airu's personal motivation is deeply tied to her late mother, as she continues her journey to fulfill both her own dreams and the dreams her mother held for the future.

In her travels, Airu is accompanied by Pochimaru, a dog-shaped AI robot who serves as her companion. Her path leads her deep into a mountain range composed of dead trees, where she encounters a boy named Izumif. Izumif claims to be a visitor from the distant future, and this meeting becomes a key event in her story. Her role in the narrative is that of a determined traveler on a restorative mission, seeking to bring life and color back to a barren world. Her actions are a direct continuation of her mother's legacy, using the magical sand as a tool for environmental revival. The official description of the character highlights her energetic nature and her commitment to this quest, but does not provide details on notable abilities beyond her use of the magic sand, nor does it outline a specific character arc or development over the course of the episode.