A Plain Young Lady Exiled as a Sacrifice in Place of Her Sickly Sister Uses Her Previous Life's Memories ≒ Game Knowledge to Transform the Frontier into the Strongest Fortress City and Become a Hero ~ Even If You Ask Me to Come Back Now, It's Already Too Late ~

Behind her glamorous younger sister, the Countess's daughter Lizette is ridiculed as "plain." One day, she is ordered to marry into the Falken frontier territory, rife with monsters, as a substitute because her sister is sickly. However, her heart trembles not with despair, but rather with delight. This is because in her previous life, she was a top-ranked player of a strategic simulation game known as the "God of War." Barren land, exhausted soldiers, low morale—— This hopeless situation is nothing less than the ultimate "high-difficulty map" for her. This is the greatest reversal story of how an unfortunate young lady transforms the frontier into the strongest front-line city using her game knowledge, and builds her own place together with the rough-mannered frontier earl.