Ok so as someone pointed out in the forums, the US Opening has very slight changes
"(censorship)" in the text next to the goddesses concerning their school year status.

So for those of you that this bothers or for purists who just want the original JP opening.
I'm making a small guide to help you all out.

Ok first things first download one of these files...

EDIT: - Steam keeps removing the links. Add (https://) + (mega(DOT)nz/) and then the link to the file you want below.

Or try this link https://pastebin.com/mD4F9215

(This one is the English version and fixes the grades.)
#!nhxGTaLS!nGBaY8uxjjQG5h5tsHJxRvoxXUrsWmz1YObvu5ThE1o


(This one is the Japanese version unaltered)
#!y0gRDSBS!2Vll2x0LlsesR8vPHcMBp-BCpj1ZGGwqtWWpbSoSX0g


Now that you have that make your way to your install directory.

(Ex)
C:\Program Files (x86)\Steam\steamapps\common\MegaTagmension Blanc + Neptune VS Zombies\data\movie

Be sure to back up the original if you want (i just made another folder named backup in the same directory)

And replace Opening.wmv with the file you just downloaded.

Enjoy!