From XscansX:
What is the purpose of your life? To live is just to die?
Is life a slow death? Do you even have your own purpose? Nao is a sensitive yet self absorbed college student, believing that reality is cruel to him. Ever since he was a child, he was categorized as a "ghost boy" whose existence was so faint that no one cared about him. One day Nao snapped and assaulted a young boy playing in a family restaurant with Tabasco sauce.
While being interrogated by the police, a mysterious beauty appeared and rescued him. Her reason was simple: "Do you want to dominate the world with me?"

At the age of sixteen Ryo Narushima was a genius and looked to have no trouble of getting into Tokyo University and joining the elite of society. However, that summer something cracked inside Ryo's head. With a small knife he brutally murdered both of his parents only leaving his sister alive and cowering in a corner. It is at this grotesque incident that our story begins.

Note: The series has been completely written & drawn by Tanaka Akio from ch.61 in Vol.26, which was the first chapter after a long hiatus, and the original author Hashimoto Izou wrote less and less starting from Vol. 4.
The series changed publishers, which lead to a restart of the chapter numbers, with Vol.20.