The soul of Nobunaga, who was engulfed in flames at Honnoji, did not disappear. When the fire exploded, his soul was ejected from his body and transported to another world.

After crossing over to another world, his soul entered the young body of Roselia Romanesco, the eldest daughter of a local lord, who was on the verge of death.

No sooner had she accepted her reincarnation than news arrived of the death of her father, the head of the family... With barely a moment to catch her breath, the girl heads to the battlefield to take her revenge.

This is the story of how Roselia Romanesco united the world.