My fiancé, who had been on a training journey, returned with a charming young girl.

And then—.

"I cannot marry you."

The moment she was informed of the broken engagement, Lady Charlotte, the Duke's daughter, realized... this was the world of the fighting game she had loved in her previous life!

"But, wait? An engagement broken off in a fighting game that had absolutely no romantic elements?"

Her fiancé, the Crown Prince, is certainly a character from the fighting game, but his demeanor seems different.

Just as the heroine seized the position of the legitimate queen, and she was about to be made a concubine, then appeared—.

An intense battle beginning with a broken engagement! FIGHT!