In Japan in 2035, an accident called "Burst" occurred in a cutting-edge scientific research project.The accident gave birth to an out-of-control artificial life form - "matter", which quickly spread to every corner of the Heibi Canyon.The research city once known as the hope of mankind has now been blocked by the government and has become a forbidden area where no one dares to set foot. Two years later, 15-year-old Aiko Tachiha lost her family in this disaster and lived alone.Just when she thought everything was a foregone conclusion, a transfer student named Yuya Kamisaki brought a shocking truth: there was an unknown secret hidden in her body, and the key to solving this mystery was the origin of the "explosion incident" - "Primary Point". Fate connects the two closely, and with unknown and fear, the beloved son decides to embark on a journey of uncertainty in life and death.Escorted by a group of experienced stalkers, Yuya leads the way, and they will cross the blockade and sneak into the forgotten city.When the fate of the boy and the girl meet and shoulder the important task of saving mankind, a dusty truth is about to surface...