Man, hunting for a good spot to read 'Sukasuka' can be a real trip. I bounced around a few places before settling. The original fan translation project, 'Shuumatsu Nani?,' had its own site years ago, but that's pretty much archived history now. For the actual Yen Press official translation, 'WorldEnd,' you're looking at ebook retailers like Amazon Kindle or Kobo.
That said, the old fan translation has a certain... charm? The phrasing felt different, more melancholic maybe. You can sometimes dig up PDFs or epubs on aggregator sites, but the quality is a crapshoot—some are fine, others are riddled with typos or missing illustrations. Honestly, for a series this emotionally heavy, having a clean, complete version matters. I'd lean towards buying the official digital volumes, even if it costs a few bucks. The pain of a janky translation ruining a key scene isn't worth the hassle.