"Big sister, that's unfair!!" is my younger sister's favorite phrase. I was supposed to become unhappy after having everything taken away by my younger sister... Huh? But instead of becoming unhappy, my treatment has been getting better.

Marika, the daughter of Count Accardo, lost her mother who was a former countess, and her father remarried less than a week later. Due to her father's remarriage, Marika gained a half-sister. Rosalie, who became Marika's younger sister, says "That's unfair, big sister" and takes Marika's things away. At first, Marika thought, "What a terrible thing for a sister to do!!" But the things Rosalie wants are always strange. The things that Rosalie takes are shabby items that Marika's stepmother gives her as harassment. The more things Rosalie takes from her, the more precious items are returned to Marika. Does she just seem selfish, but is actually a good girl?