In Japan in the year 2035, an accident known as the "Burst" occurs during a research project, spawning an out-of-control artificial life form called "Matter" that has spread throughout the Kurobe Gorge. The research city that was once hailed as the hope for humanity is cordoned off by the government.
Two years later, 15-year-old Tachibana Aiko, who lost her family in the Burst, learns something unbelievable from Kanzaki Yuuya, a new student at her school. Unknown to herself, a secret is hidden within her body, and the answer to the puzzle lies at the "Primary Point" that was the center of the Burst. Aiko resolves to infiltrate the restricted area, escorted by a team of divers and with Yuya as her guide.
When boy meets girl with the fate of humanity in their hands, what new truth will come to light?