I'm surprised at people judging an story MV before we even have the full story. The "to be continued..." in this case could just be because it's a short version, or another MV in the album will have the continuation, whatever the case, there's no point judging the story before it's complete.
But I must say, I really like what we have so far, it's well done imo. And can we stop to appreciate how Ayu's Christmas song MV starts with her carrying the body of her dead boyfriend with a trail of blood behind?