"Girls' Last Tour" is a post-apocalyptic manga series set in a desolate, war-torn world where civilization has collapsed. The story centers on two young girls, Chito and Yuuri, who traverse the ruins of a once-thriving society in a small, tracked vehicle. The pair scavenge for food, fuel, and supplies while exploring the remnants of human existence, including abandoned cities, factories, and military installations. Their journey is marked by a sense of quiet melancholy, as they encounter the remnants of technology, culture, and history, often pondering the meaning of life and the nature of humanity.

Chito, the more thoughtful and introspective of the two, often reflects on the world they inhabit, while Yuuri is more impulsive and carefree, providing a contrast in their dynamic. Despite the bleakness of their surroundings, their interactions are often lighthearted and filled with moments of humor and camaraderie. The narrative is episodic, with each chapter presenting a new location or discovery, offering glimpses into the past and the mysteries of the world.

As they travel, Chito and Yuuri encounter occasional remnants of advanced technology, such as autonomous robots and artificial intelligence, which raise questions about the nature of consciousness and the legacy of human ingenuity. They also meet a few other survivors, though these encounters are rare and often fleeting, emphasizing the isolation of their journey. The series explores themes of existentialism, the passage of time, and the resilience of the human spirit, all while maintaining a subdued, contemplative tone.

The manga concludes with an open-ended resolution, leaving the fate of Chito and Yuuri ambiguous but imbued with a sense of quiet acceptance. Their journey serves as a meditation on the fragility of civilization and the enduring bond between the two protagonists as they navigate the remnants of a world long gone.