The heart of December Sky is the psychological and physical duel between two ace pilots who represent opposite ends of the war's psychological toll:
The film takes place in the "Thunderbolt Sector," a shoal zone in the ruins of the space colony Side 4: Moore. This area is a graveyard of destroyed colonies and battleships where drifting metallic debris creates constant, unpredictable electrical discharges—hence the name "Thunderbolt". mobile suit gundam thunderbolt december sky
For the , the sector is a vital supply route to their stronghold at A Baoa Qu. To hold it, they deploy the Living Dead Division , a unit primarily composed of amputee soldiers who serve as snipers. Opposing them is the Moore Brotherhood , an Earth Federation squadron made up of former Side 4 residents driven by a desire to reclaim their destroyed home. A Rivalry of Two Devils The heart of December Sky is the psychological