The narrative takes place in a fictional Germany and focuses on the emergence of biomechanical entities called "Demoniacs," which rise from corpses to attack people without thought. These Demoniacs can merge with most technology, such as cars and motorcycles, not only taking control of them but also significantly boosting their performance. Opposing them is a group known as XAT, the Xenogenesis Assault Team, who police these Demoniacs in an effort to maintain peace and uncover the reasons behind the "Demoniac" transformation. Meanwhile, several humans turned into Demoniacs appear. Some employ their powers for good, while others use them for evil. One individual will rise above all other Demoniacs to become the "Blassreiter".