Are You My Other Half?

Jack Frost has saved the world and accepted his role as the Guardian, but he can't deny or ignore his loneliness. Jack seeks for his other half and find a young girl who is a princess named Elsa. Elsa is terrified of her powers because she harmed her beloved sister, Anna. Therefore she is secluded in her room. Yet a boy named Jack, who claims to be the same as her, visits her.