"Girls' Last Tour" is set in a post-apocalyptic world where civilization has collapsed, leaving behind vast, desolate ruins. The story centers on two young girls, Chito and Yuuri, who travel together through the remnants of a once-thriving society. They navigate the eerie, empty landscapes in their Kettenkrad, a hybrid motorcycle-tank, scavenging for food, fuel, and supplies to survive. The setting is characterized by towering industrial structures, abandoned cities, and a pervasive sense of isolation, emphasizing the absence of human life.

Chito, the more reserved and intellectual of the two, often takes on the role of navigator and keeper of knowledge, reading from a small collection of books they carry. Yuuri, in contrast, is more impulsive and carefree, providing a counterbalance to Chito’s cautious nature. Their dynamic is central to the narrative, as their conversations and interactions explore themes of survival, purpose, and the fleeting nature of existence. Despite the bleakness of their surroundings, their bond and shared moments of curiosity and wonder bring warmth to the story.

As they journey through the ruins, Chito and Yuuri encounter remnants of the old world, including advanced technology, art, and cultural artifacts. These discoveries prompt philosophical reflections on the nature of humanity, progress, and the inevitability of decline. The series does not focus on action or conflict but instead emphasizes the quiet, introspective moments between the characters as they grapple with their circumstances. The narrative unfolds in a slow, contemplative manner, allowing the audience to immerse themselves in the atmosphere of the world and the emotional depth of the characters.

The overarching goal of their journey is to reach the top of a massive, layered city structure, which they believe might hold answers or a better life. Along the way, they occasionally meet other survivors, each encounter offering glimpses into how others cope with the desolation. However, these interactions are fleeting, reinforcing the theme of isolation and the transient nature of human connections in their world.

"Girls' Last Tour" is a meditative exploration of survival and companionship in a world stripped of its former glory. The story’s strength lies in its ability to balance the stark, melancholic setting with the resilience and humanity of its protagonists, creating a poignant and thought-provoking narrative.