Car-kun is a red sports car living and working in Mobile Land, an island community of anthropomorphic vehicles. He works as a delivery worker, transporting packages and goods across the island. His daily routine centers on completing these deliveries while navigating Mobile Land's environment.

During his work, he consistently adheres to traffic regulations and safety practices, forming a fundamental part of his travels throughout the island. These journeys allow him to encounter and interact with numerous resident vehicles, leading to relationships with various characters.

Among these relationships, he frequently navigates interference from Ruster (also known as Sabibi), a character who regularly disrupts his deliveries. Other significant figures in his social circle include Amy, who shares his daily experiences; Polly, another resident; Pudding; Felix, who fulfills specific functional roles; and Pops, an older character offering guidance within their community.

His activities go beyond transporting packages. His delivery assignments often involve participating in community events, assisting with local tasks, and engaging with various Mobile Land service providers. These include interactions with maintenance services, emergency responders, and transportation systems, all integrated into his daily responsibilities.

Throughout his documented experiences, he maintains a consistent focus on delivery work, community interaction, and traffic safety within Mobile Land.