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I am Japanese.

The DVD of movie have been sold since this March.

Although I searched many information by Google in Japanese, there are no information about English subtitles.

I don't know anything whether there are English subtitles or not.

You can buy the DVD through Japan.

But if there are not, you cannot understand what the characters say in Japanese.

I suggest that watch this movie Japanese friend who can speak English very well.

How about buying the DVD?

At least, it will never happen that you cannot watch the movie.

If there's a website you usually watch things like that on, try requesting it to be subtitled.

Keep an eye out on ebay for it, that's usually where I find them, other than that Amazon.jp has it, but no word on English subtitles.

I don't know why, but it always seems hard to find any movies with one of the Hello Project members in it online.

Did you mean this?

http://ranobe.jp/trailer.html

I think you can find some of them at YouTube.