The cursed siblings.- shinazugawa siblings

Y/N is sanemi's younger sister, she is fourteen years old. Her and genya still talk, but sanemi does not talk to either of them. He hates them, apparently. Y/N was only about 5 or 6 when their parents died. She was stuck in the house when sanemi and genya ran after their mother. She was stuck in the house with all their dead siblings, frozen in horror, she ran, far far away. She didn't see sanemi or genya for years...until..