In the near future, three biologists are on a joint research trip to use their ONYX implants to research the creatures of the uninhabited Sephonie Island. However, a mysterious phenomenon destroys their ship, leaving them shipwrecked.

Amy Lim, Taiwanese-American and bold leader, hails from the midwestern USA town of Bloomington. Riyou Hayashi, an analytically-minded Japanese-Taiwanese researcher, calls the bustling Tokyo his home. And Ing-wen Lin, a kind and considerate Taiwanese scientist, lives in Taipei.

The trio will find their motivations and loyalties put to the test as they navigate Sephonie’s caverns, facing not only rocks and creatures but also their deepest memories and dreams. As they grow more intimate with each other and the island, an ancient force, brewing deep in the island's abyss, may threaten their newfound relationship, and the world...