Set in the Taisho era, Kawahori, a lone assassin armed with a traditional gun and lethal skills, operates independently without allegiance to any group. Despite outward hostility, the organization's leading assassin, Lobo, secretly harbors admiration for Kawahori. As fate intertwines their paths, Lobo finds herself tasked by the organization to eliminate Kawahori. In a deadly clash for survival, who will emerge victorious in this life-threatening confrontation?