Maybe I’m the most unfortunate person in the world.

The protagonist, unloved by her family and alone even at the moment of her death, is reincarnated into the world of a novel as a girl named Isolette, who grows up in a miserable environment.

One day, a man named Bernand, heir candidate to a count family, appears before her. He claims to be Isolette’s father and proposes that they become “contract parent and child.”

Though confused, Isolette agrees in hopes of escaping her situation.

Thus begins the strange fate of Isolette, who ends up becoming a contract daughter to her real father.