Chou Sekiei, once the legendary hero Kou Eihou, seeks a tranquil life as a civil servant in his current existence. Despite his desire for peace, his inexplicable combat abilities draw him back into a world of conflict. Trained by the celebrated general alongside the talented and beautiful Chou Hakurei, Sekiei finds himself embroiled in rescuing young merchant geniuses. However, his aspirations for a quiet life are shattered when the foreign nation of Gen launches a war, compelling him to wield his formidable skills once more. As Sekiei and his companions face the invasion, they must band together to protect their homeland and secure victory in the face of danger.