"Genshi Otome to Kami no Tou" is a fantasy manga series that blends elements of adventure, mystery, and supernatural themes. The narrative centers around a young girl named Lili, who lives in a primitive village where the inhabitants worship a towering structure known as the Divine Tower. The tower is revered as a sacred place, and its upper levels are shrouded in mystery, believed to be inhabited by gods. Lili, however, harbors a deep curiosity about the tower and its secrets, which sets her apart from the other villagers who fear and respect it without question.

One day, Lili encounters a mysterious boy named Eru, who falls from the sky near the tower. Eru possesses advanced knowledge and technology that are completely foreign to Lili's world, suggesting he comes from a more advanced civilization. The two form a bond, and Eru reveals that he is searching for something within the tower. Intrigued by his mission and driven by her own desire to uncover the truth, Lili decides to accompany him on his journey.

As Lili and Eru ascend the Divine Tower, they encounter various challenges, including hostile creatures, ancient traps, and enigmatic guardians. Each level of the tower presents new mysteries and dangers, gradually revealing the tower's true nature and its connection to the world outside. Along the way, they meet other characters who either aid or hinder their progress, adding layers of complexity to their quest.

The relationship between Lili and Eru evolves as they face these trials together. Lili's innocence and determination contrast with Eru's pragmatic and sometimes aloof demeanor, creating a dynamic that drives much of the story's emotional core. Their journey also raises questions about the origins of the tower, the gods it is said to house, and the broader implications of their discoveries for Lili's world.

The manga explores themes of curiosity, the clash between tradition and progress, and the search for truth in a world governed by myths and legends. The narrative is structured around the duo's ascent of the tower, with each level serving as a self-contained arc that contributes to the overarching plot. The story maintains a steady pace, balancing action, character development, and world-building to create an engaging and immersive experience.