The Mysterious Tale of Yumi-chan

Everything fell apart after the miscarriage of Nori's sister. Her husband left her and she was reduced to a depressed shut-in. One day she suddenly brought home a cute little girl called Yumi-chan, who was supposed to be her friend's kid. Nori's sister soon regained her smile, but Nori felt something was off with Yumi-chan, and the rest of her family.