Golosseum

Golosseum (ゴロセウム, Golosseum) is a manga written and illustrated by Baba Yasushi.

Plot
A mysterious substance incorporated in bracelets makes men more powerful than ever. Bullets, sharp weapons and other missiles do not kill them. From there, a sort of Fist World War is set in place for this new human race to dominate the world. In the middle of this hunting area, a woman, Sasha Gundarenko (nicknamed the White Witch), imposes her style through jujutsu techniques that were taught her by ... Rasputin!