"Fractale" is set in a futuristic world where humanity relies on the Fractale System, a vast network that maintains societal order and provides for people's needs. The system is powered by doppels, virtual avatars that assist humans in their daily lives. Society has become complacent, with many people living in isolation, disconnected from reality, and dependent on the system. The story begins with Clain, a young boy living in a remote village, who encounters a mysterious girl named Phryne after she crashes near his home. Phryne is pursued by unknown assailants, and before she disappears, she leaves Clain with a special pendant containing a doppel named Nessa.

Clain, driven by curiosity and a desire to understand Phryne's situation, embarks on a journey with Nessa to find her. Along the way, they uncover the darker aspects of the Fractale System and its impact on society. The system, once a symbol of progress, has become a tool for control, perpetuating inequality and stifling human connection. Clain and Nessa encounter various factions, including the Lost Millennium, a group opposing the Fractale System, and the Temple, the organization responsible for maintaining the system. Phryne is revealed to be a key figure in the Fractale System, with her existence tied to its stability.

As the narrative progresses, Clain learns about the system's origins and the sacrifices made to sustain it. The story explores themes of technological dependence, the erosion of human relationships, and the consequences of societal complacency. Clain's journey becomes a quest to challenge the status quo and restore balance to a world increasingly detached from reality. The series concludes with a resolution that questions the sustainability of the Fractale System and the potential for humanity to reclaim its autonomy. The characters' growth and the world's transformation highlight the tension between technological advancement and the preservation of human values.