In the year 2029, Earth faces a catastrophic crisis as 99.9% of its elements vanish due to a mysterious phenomenon known as the "Phantom Abyss." This event destabilizes the planet's environment, leading to widespread chaos and the collapse of ecosystems. To combat this, the United Nations establishes the "Element Hunters," a specialized team of young individuals with unique cognitive abilities that allow them to perceive and interact with the lost elements in a parallel dimension called Nega Earth. This dimension is a mirror world where the missing elements have been transported, and it is fraught with dangers, including hostile creatures known as "Phantoms."

The team consists of six members: Ren, a determined and resourceful leader; Tomoru, a brilliant but socially awkward scientist; Kana, a cheerful and athletic girl; Chisato, a calm and analytical strategist; Adrian, a skilled and confident fighter; and Leon, a mysterious and aloof individual with a hidden agenda. Each member possesses a distinct skill set that contributes to the team's success in navigating Nega Earth and retrieving the lost elements. Their mission is to recover the elements and restore Earth's balance, but the journey is perilous, as they must confront not only the Phantoms but also the moral and ethical dilemmas of their actions.

As the story progresses, the Element Hunters uncover deeper layers of the Phantom Abyss, discovering that it is not a random event but the result of human interference with the natural order. The team faces internal conflicts and external threats, including rival factions with their own agendas for Nega Earth. The narrative explores themes of environmental responsibility, the consequences of scientific advancement, and the resilience of humanity in the face of existential threats. The series balances action-packed missions with character development, revealing the personal struggles and growth of each team member as they grapple with their roles in saving the world.

The plot is driven by a series of episodic missions, each focusing on the retrieval of a specific element, while also advancing the overarching mystery of the Phantom Abyss. The stakes escalate as the team encounters increasingly powerful Phantoms and uncovers secrets about Nega Earth's origins. The series culminates in a climactic confrontation that tests the limits of the Element Hunters' abilities and resolve, ultimately leading to a resolution that ties together the narrative threads and provides closure to the central conflict.