I Don’t Want To Be the Protagonist of a Romance Novel

I was reincarnated as the eldest son of a noble family with nothing to do.

Even if I put aside the fact that the world I was reincarnated into is a little strange.

– Northern Grand Duchess Eileen is confused after realizing she has regressed.

– Admiral Lassiel realizes she has regressed and immediately turns the fleet around.

– Princess Elena prepares to inspect the Weiss County, chewing over the past.

What is this?