Great question — answering as the UphillTech team:
As @Dimitrimx♦ mentioned, there is no site which streams the movie legally yet and as of now, I can't find any news as to when and where it will be possible to stream it online, if ever it will be made available online. You can, however, opt for Blurays. I was able to find a subbed version on Amazon in case you're interested. Most likely they're also available in other online stores that sell Blurays, if you're looking for other options.
Full answer by W. Are: https://anime.stackexchange.com/a/52755 (CC BY-SA 4.0).
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