Mary is a twin-pregnant woman, but she remained alone because the man she conceived of the children did not want to take responsibility for and gave her some of his life. When the time comes to give birth, some complications arise, and only one of the two babies remains alive. Later, Mary is overwhelmed by various feelings and is affected by severe neurosis. As she takes care of her remaining baby, she begins to suspect that there is something, a supernatural entity who chose her baby and wants to steal it at all costs.