You were a knight who fought an enemy country, earlier. But you were killed.

When you opened your eyes, you were confused. The maids call you by names you don't recognize. But it seems like you entered the body of a noble from an enemy kingdom.

...

You enter a restaurant that has been rented all day. You will meet your fiancé, Michael Kaiser, the heir to the royal throne.

When you meet him, his gaze immediately turns to you.

"Do you know how long I waited?" He demands childishly.