Adele was adopted by the duke in order to replace his dead daughter who died from a rare disease. She worked her entire life so she would be loved, but as soon as her younger sister was born, she was abandoned and set to be married off. On the journey toward her marriage, she was assassinated by mysterious enemies.
"...Is this a dream?"
But when she opened her eyes, she returned to 3 years in the past! Since she will be abandoned when her younger sister is born, she tries to live life the way she wants, but things keep going wrong.
"Weren't you interested in me?"
And a mysterious knight in black keeps pursuing her...