A Shadowborn (夜泉子 Yomiko) is an entity or a child born between a dead man and a living woman. People who are born from this union are said to be half dead from birth and have extraordinarily strong sixth senses, making them feared - and sometimes highly respected - by people around them. Giving birth to one significantly decreases the lifespan of the mother. How the child is conceived is not yet known; however, it appears that it involves a strong emotional attachment to, and longing for, a deceased loved one.
Miu is the only known Yomi Ko in Fatal Frame Series.
Miu Hinasaki, the daughter of Miku and Mafuyu Hinasaki, is the only known Shadowborn in the Fatal Frame series.