Midnight eye - Buichi Terasawa

In this volume, Goku fights against a Chinese crime syndicate called Black Dragon. A young call-girl called Li-Chen approaches Goku and asks him to find her missing sister. He undertakes the mission and finds out that Li-Chen's sister has also been captured and forced to work as a prostitute for Black Dragon. Can Goku save her? Then, Goku's old friend is brutally killed. Goku starts to pursue the killer to avenge his friend and finds out that the killer has received powers which allow to transform into any creature at will. Will Goku survive this nightmare?