One night, a young scientist named Heidi and his assistant, Chitose Toriiooji, receive a request from the police department to assist them on a peculiar case of the discovery of a mysterious glowing corpse.
As Heidi and Chitose analyze the corpse, it starts reacting and transforms into a grotesque looking monster. The situation quickly escalates and Heidi as he has been grievously injured, starts mentioning about the strange Black Apple that he possessed. He then decides to take the chance and bites the apple. After a sudden blood loss, he gained the power to control gravity and easily defeat the monster.
Later on, he finds out through a mysterious figure that his apple is actually a supernatural item known as the Eureka, with his apple is called the Newtonian Apple, and there are more of them exist in this world. Heidi along with his assistant must now race alongside the organization, White Joker, who claims to have a relation with his past, to collect all the Eurekas and prevent the humanity extinction from a terrorist group called Mavro.