The story of Hexagon Experiments is set on the planet Erythra, where 1k1 Corporation conducts experimental research. During one of these experiments, a test vehicle returning to Earth malfunctions and crashes into a settlement. A bacterium, brought to Earth for study, is released in the accident, infecting those investigating the crash site and triggering a spreading infection. The outbreak escalates to a global scale.
Within 1k1 Corporation, two subsidiaries—1k1 Industries and 1k1 Genesis—develop the Zethrion 9 human prototype. To combat the pandemic, a cure must be developed on Erythra. A 300-day deadline is set to create the vaccine. During this period, Zethrion 9 operates in a central lab on Erythra, surrounded by greenhouses. Zethrion 9 is tasked with cultivating plants in these greenhouses to develop the cure.
Additionally, an unexpected challenge arises: a shield covering a specific area deactivates at night due to power imbalances. When night falls, Zethrion 9 must defend the lab and plants from creatures roaming the planet.
