 Kayako starts haunting an apartment building which leads to her sister, Naoko, trying to stop her.Kayako does not attempt to attack or kill Naoko, but the spirit of her murderous husband does, and Naoko is killed in an even more violent fashion than her sister.Naoko then shockingly turns into a vengeful Onryō as well, despite her mother not feeding her evil spirits like she did Kayako, and kills her attacker.