A modern special forces soldier, Arthur Lancaster, dies and reincarnates as the worthless Third Prince of Valorian Dynasty. Framed for assault by Crown Prince Victor and his scheming sister-in-law Isabella, Arthur awakens a modern military arsenal and strikes back. The arrogant Viperian army provokes Valoria with matchlock guns. After Victor’s humiliating defeat, Arthur steps up to defend his nation’s honor. Overconfident in their weapons, the Vipers wage war under a false pretense. Unleashing tanks, warplanes and carriers, Arthur crushes their expansion. In the final battle, nuclear fire wipes out the Viperians and levels their island realms.