Kyū-chan is an ambulance residing in Mobile Land, frequently encountered by the protagonist during deliveries. She embodies reliability and swift responsiveness, specializing in providing medical assistance and urgent aid. As an anthropomorphic vehicle within this community, she operates cooperatively with others, strictly adhering to traffic and safety protocols.

Her key narrative focus appears in the episode "Cool Ambulance." This episode details her operational characteristics and demonstrates her contributions within emergency scenarios, integrating her into the island's daily life through interactions during both routine and critical events. Her consistent presence supports the series' educational themes highlighting community roles and vehicular cooperation. Kyū-chan remains a steadfast supporting figure within the ensemble cast, contributing to the communal and instructional setting.