Can someone explain the ending of "One Missed call", the first film of japanese edition, let's say? What happens after yumi nakamura gets possessed? When Yamashita gets stabbed, what happens in the hospital?

The possessed Yumi kills him. Obviously.

Not really. He awakens in the hospital.

Yes, and then Yumi gives him a candy. What happens during the credits is him getting killed.

I guess so, but I searched the internet and discovered that nobody killed accepted the candy before. Not that it means much. I could be entirely wrong.

Well, that’s why they call it a cliffhanger ending. You’re left to make up your own mind about it.