Alfa Ndiaye is a Senegalese man who, never before having left his village, finds himself fighting as a so-called "Chocolat" soldier with the French army during World War I. When his friend Mademba Diop, in the same regiment, is seriously injured in battle, Diop begs Alfa to kill him and spare him the pain of a long and agonizing death in No Man's Land. Unable to commit this mercy killing, madness creeps into Alfa's mind as he comes to see this refusal...