"12" is a manga series that unfolds in a dystopian future where humanity faces extinction due to a mysterious virus. The narrative centers on a group of twelve individuals, each bearing a unique genetic marker that makes them immune to the virus. These individuals are brought together by a clandestine organization known as the "Eden Project," which aims to use their genetic material to create a cure and ensure the survival of the human race.

The protagonist, Akira, is a young man with a troubled past who discovers his immunity after surviving an outbreak in his hometown. Alongside him are eleven others, including the enigmatic and resourceful Yuki, the stoic and disciplined Ryo, and the compassionate yet fiercely independent Hana. Each character brings their own skills, backgrounds, and motivations to the group, creating a dynamic interplay of personalities and conflicts.

As the story progresses, the group is transported to a remote facility where they undergo rigorous testing and experimentation. Tensions rise as the true intentions of the Eden Project come into question, revealing a web of deceit and manipulation. The characters must navigate a labyrinth of ethical dilemmas, personal betrayals, and the constant threat of the virus, which continues to mutate and spread.

The plot thickens with the introduction of external factions, including rogue scientists and militant groups, each with their own agendas regarding the fate of the twelve. The narrative explores themes of survival, trust, and the moral complexities of scientific advancement. The characters are forced to confront their own fears and desires, leading to moments of intense drama and emotional depth.

Throughout the series, the stakes escalate as the group uncovers the full extent of the Eden Project's plans, which involve not only the creation of a cure but also the potential for genetic engineering to reshape humanity. The climax of the story sees the twelve facing a critical decision that will determine the future of the human race, culminating in a resolution that balances hope with the harsh realities of their world.

"12" is a compelling exploration of human resilience and the ethical quandaries posed by technological and scientific progress, set against the backdrop of a world on the brink of collapse. The series is marked by its intricate plot, well-developed characters, and thought-provoking themes, making it a notable entry in the dystopian genre.