Ichi The Killer

[from anime news network]: in shinjuku kabuki-cho, the biggest sin town in japan, there are two crazy guys. ichi is a coward and a wimp, but once he breaks into tears, he turns into a human weapon. with great martial arts skill and a blade hidden in his boots, he butchers a bunch of enemies into mincemeat in the blink of an eye. his arch enemy is kakihara, a yakuza boss who's tired of everything, including himself. only when he pierces, cuts, and burns his own and other people's bodies does he feel that he is alive. warning: very graphic content.