What are /r/sukasuka's favorite Products & Services?

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I've heard that EPUB format is better for mobile devices. So maybe you should look into that as well.

As for PDF, you probably can find some suitable viewer/reader in this list: https://en.wikipedia.org/wiki/List_of_PDF_software

Particularly, MuPDF looks like a decent choice for a phone. It even supports EPUB files too, though I have no idea how well it handles them.

On another note, the story in Shuumatsu Nani Shitemasu ka? can get pretty emotional at times. So I think that it might be better to read it when you don't have to worry about your surroundings and can get fully immersed.

5 volumes of the first arc has been published and translated in English, they can be found in both ebook and paperback format on Amazon

Get yourself some tissue paper though, because the novel hurts twice as much.