Frozen

The Disney movie "Frozen" will be released tomorrow in Japan.

I can't wait !

I'm going to watch it with my boyfriend when he comes to Japan.
He has already watched it in his coutry though.

So I am reading an original book first.

Frozen

The Disney movie "Frozen" will be released tomorrow in Japan.

I can't wait!

I'm going to watch it with my boyfriend when he comes to Japan.
He has already watched it in his country though.

So I will read a the (original) book before I see it. at first. (You don't really need "original". We talk about "the book" and "the film". I liked the book but the film was awful)

The fact that your boyfriend has seen the film is not a reason for you to read the book. You could say:

So as I have the time I will read the book first.