In the glowing perfection of Earth’s biospheres, Rin Catena thrives as an environmental engineer, maintaining the flawless balance between nature and technology. Under Gaianet’s watchful eye, life is serene—rivers shimmer, forests glow, and biomechanical creatures roam without flaw. For Rin, it is paradise, and nothing seems out of place.

But when her sister, Saya, vanishes, Rin’s world begins to unravel. Her search for answers leads her to Kaito Libero, a former engineer and her former lover.

As the illusion of perfection starts to crack, Rin finds herself drawn into a web of secrets that Gaianet insists are better left untouched. In a world where harmony reigns, can she trust what she’s been told? Or has something darker been hidden beneath the surface all along?