Often called "Killer" of "Killer Acid", Ryuuichi Sasaki is an assassin who lives in the Tama district of Tokyo. Not a lot is known about his childhood, exept he lived with his parents and that his killer instincts were formed when he was young. He went to high school and had 2 years of technical school were he learned to kill. He loves small animals, which is also his biggest weakness. He gun of choice is teh Beretta M92. (Source: Loosely adapted from the Japanese Wikipedia).