My Dear Daughter, Love Me Once More

Aria's mother has kept it from her husband that she is a duke's daughter. She married him as an ordinary woman, and he treats her and the child on that basis. He wants only his first love, and he will not let Aria, his own daughter, call him "Dad". Aria waits for him the whole of her birthday and sees him propose to his ex. At the school talent show his mistress and the mistress's daughter go at Aria in front of everyone, and he takes their side. He wants Aria's place at summer camp for the other girl, so he gives Aria strawberry cake, knowing what strawberries do to her. She nearly dies of it. Her mother files for divorce and tells him what family she comes from. From then on she uses that name to press her daughter's case.