a duke’s daughter, suddenly gains a stepbrother when she is young.
Believing him to be her father’s illegitimate child, and knowing he has no education or manners, she treats him harshly while “training” him.

But Nigel never resents her. Instead, he adores her, always calling,
“Sister… Sister…”
Even though she thinks he must hate her, he actually loves her deeply…!?

A slow-burn, doting love story between a strong-willed noble lady and her quietly obsessive stepbrother who loves his big sister far too much.