Kuroi Ame ni Utarete

Overview

It's about young people in postwar Hiroshima getting involved in the black market for weapons. The main character is an A-bomb survivor whose hatred drives him to kill an American black marketeer. He asks the Americans, "Who are you to talk about justice when you massacred hundreds of thousands of innocent people in Hiroshima, in Nagasaki, in the firebombing of Tokyo? Was that what you call justice?"

Source: AniList