I'm Catherine.

I grew up a commoner, but now that the Duke is remarrying my mother, I'm being taken in by the ducal family.

Wow, isn't that incredibly lucky?

I'll use this good fortune to bag myself a top-tier gentleman, rich and high-status!

That's what I was determined to do, but my half-sister keeps bugging me, and it's irritating.

To make matters worse, despite being so much plainer than me, she's constantly drawing attention in both the territory and high society, and it seriously ticks me off.

Well, if that's how it's going to be, I'll just steal the First Prince, her fiancé, right out from under her!

...But wait, isn't my sister actually the higher-spec, more valuable catch than the Prince...?