Aku no Joou no Kiseki

Mari, a college student, awakens on a battlefield surrounded by knights in Western-style armor who address her as "Her Majesty the Queen." Her forces are engaged in a desperate battle against overwhelming odds. Assuming it is a dream, she formulates a strategy to turn the tide, only to realize she has truly been transported into the body of a queen in another world. As an ordinary student thrust into an unfamiliar setting, she must navigate the challenges of ruling in a fantasy realm.