Arc 1: The Introduction to the Downsiders' World & Risa's Initial Struggles: This section introduces us to Risa, a Downside girl struggling to survive in the harsh realities of the Bottom, and gives us a glimpse into the stark social divisions between the Upsiders and Downsiders. We learn about the dangers and the daily routines of life in this impoverished sector, and meet some of the key players in her life.
Arc 2: The Confrontation with the Upsiders and the Introduction of Cole: Risa's experiences bring her into conflict with the Upsiders, highlighting the extreme inequality and cruelty of their system. We're introduced to Cole, an Upside boy living a privileged life, but wrestling with his own dissatisfaction. This section showcases the contrast between their worlds and the initial seeds of a potential connection.
Arc 3: The Exploration of the Divide and Shifting Alliances: Risa and Cole's paths begin to intertwine as they each navigate their respective worlds, facing dangers and challenging the established order. We see how different members of society respond to their actions, and how difficult it is to bridge the gap between Upsiders and Downsiders. The mystery surrounding the "miracle" also deepens.
Arc 4: Unraveling the Mystery and Facing the Consequences: This section focuses on the uncovering of the truth behind the "miracle" and the ramifications of their actions. The characters' relationships deepen and are tested under immense pressure. Alliances shift, and betrayals are revealed.
Arc 5: The Final Confrontation and Uncertain Future: This is the climax of the story, where the characters make their final stands against the oppressive system. The outcome is not a simple victory, and leaves the reader with a sense of hope mixed with uncertainty about the future.
It's important to note that these are broad sections, and the narrative constantly shifts perspective between several characters' viewpoints, weaving a complex story of inequality, survival, and rebellion. The true "chapters" are the individual journal entries, providing fragmented yet intimate perspectives on the events unfolding.