So the Duchess Disappeared

On condition that I give birth to an heir, I made a contract marriage with the Duke.
And I finally got pregnant. I thought I would be guaranteed a comfortable life now.
But I wasn’t.
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“That woman must be killed when the baby is born.”
I faced the unbelievable truth.
The Duke only wanted an heir.
So, I ran away from the Duke’s mansion with the baby in my belly.