Takuya endured pain that no one should ever had to go through. At a young age, he witnessed his parents being murdered and soon after that he was unwillingly seperated from his twin brother Takumi. Years later, Takuya joined the secret organization, Cross Gene, in the hopes of finding his parent's murderer and his brother, who he hopes is still alive. Because of everything that Takuya went through as a child, he grew into a anti-social and distant person. Making everyone around him, including his team members, to think that he was a stuck up jerk. But when the group gains a new leader, Shin, everything changes ... is it for the better or for the worse?