"Ark Angels" is a manga series set in a futuristic world where humanity faces environmental collapse due to rampant pollution and ecological destruction. The story centers on a group of genetically engineered children known as the Ark Angels, created to survive and thrive in the harsh new world. These children possess unique abilities and are raised in a controlled environment, isolated from the deteriorating outside world. Their purpose is to serve as the last hope for humanity's survival, tasked with restoring the planet and ensuring the continuity of life.

The protagonist, Hana, is one of the Ark Angels, distinguished by her strong will and empathy. Alongside her are other key characters, including Rei, a stoic and analytical figure, and Aoi, a cheerful yet deeply conflicted individual. Each Ark Angel embodies different traits and abilities, reflecting the diverse approaches to solving the crisis. The narrative explores their struggles as they grapple with their identities, the ethical implications of their creation, and the weight of their mission.

As the story progresses, the Ark Angels are thrust into the outside world, encountering the remnants of human society. They face moral dilemmas, such as whether to prioritize the preservation of humanity or the restoration of the planet. Conflicts arise not only from external threats, such as rogue factions and environmental hazards, but also from internal tensions within the group. The series delves into themes of environmental responsibility, the consequences of scientific advancement, and the nature of humanity itself.

The plot is driven by the Ark Angels' journey to uncover the truth about their origins and the extent of their creators' intentions. Revelations about their purpose and the true state of the world challenge their perceptions and force them to make difficult choices. The narrative balances action, introspection, and world-building, creating a compelling exploration of a dystopian future and the role of the next generation in shaping it.