In the year 2030, after nuclear devastation has left the planet barren, survivors work to protect what remains of humanity inside a massive domed city as part of the ambitious Megaro Earth Project. Elite sniper EL leads a specialized counter-terrorism unit tasked with thwarting the schemes of the enigmatic Gimmick and his Black Widow organization. While pursuing this mission, EL rescues the endangered Parsley from an ambush, setting the stage for an uneasy encounter at Club 1991 that could shift their allegiances. At the same time, pressures mount at the Sniper Control Office where Natsuki faces rigorous questioning.