ANGEL'S SONG PV

[Chibi_Venus]

I'm having such a hard time interpreting this PV...

Here are a few questions I have about the PV:

1) What's with her turning into a wolf? Does it have a connection with the lyrics?

On my way home from the bustle of the city
Though it was no different from any other day
I thought I would repeat such pattern of life
And tears welled up suddenly

So... is the wolf symbolizing, like, a different side of her that awakens? Or what? (lol)

2) Does the date have anything to do with the song (look at the check for the date)? I believe the date is August 1967. Any reason why this is in the 60's, or is that just a time era Ayu liked?