I'm Looking for a Movie (read description)?

hi, soooo this movie was a American film with a blond female protagonist in a Japanese city, I have no clue WTF she does as an occupation in the movie, I just know the movie has to do with a Japanese dad who killed his family, and that only one of the children survived, some how the protagonist is involved!

this all occurred in a house! the mom got stuffed in a plastic bag, and everyone else, I have no clue!

now! I remember the ending!

literally all of the family came back to life, they were all going towards the protagonist, and literally the mom was crawling down the stairs from the second floor, with the half the bag being dragged behind her, while the daughter and the son approach her from the first floor!

their was also a guy, and he gets killed, I think . . .

last thing that happens is the mom getting very close(face to face) to the protagonist and everything going dark and switching to a new setting!

theirs also a scene where they leave the kid that survived alone in a room and he started making a very weird screeching noice.

CAN SOMEONE TELL ME THIS MOVIE??