Kasumi Abiko is an instructor at the Yokogawa branch of the Shinkansen Ultra Evolution Institute, tasked with training the children who pilot the Shinkalion Z units. Her primary focus is developing the skills and combat readiness of these new drivers. While she maintains a serious and professional demeanor in her instructional role, she possesses a personal hobby undisclosed to others, creating a contrast with her disciplined approach to her duties.

Introduced in Episode 01, she is part of the Yokogawa branch team that faces giant monstrous beings. She works alongside colleagues including Commander Misaki Ōishi, maintenance leader Goichi Shima, and mechanic Atsuta Hosokawa. Her operational base is the Yokogawa branch facility, the central hub for developing and deploying the Shinkalion Z robots and their Zailiner support units.

Details of her background prior to joining the institute, any familial connections, or specific character development arcs across the series are not defined. Her participation in other media such as films, OVAs, or spin-offs is also not defined. Her documented role centers on her instructional position within the Yokogawa branch during the events of the series.