Aku no Joou no Kiseki

A university student named Mari finds herself in the middle of a battlefield surrounded by knights in Western armor who address her as “Her Majesty.” Confused and believing it to be a dream, she devises a strategy and leads her outnumbered forces to victory. However, she soon discovers that she has somehow taken the place of the queen. Mari learns that the war stems from the queen’s poor rule and realizes she cannot return to her original body. Determined, she resolves to rebuild the damaged country.