>>281566427
Alright anon, if you're even around to read this:
Back when in a PSG thread around when the first real trailer trailer got released I mentioned this was my favorite doujin and an anon flexed on me by showing that he had a physical copy. Afterwards either he or someone else tracked down a copy for me by (if I remember correctly) messaging the mangaka on Pixiv to ask where/how to find a copy, and a listing on Suruga-ya.jp turned up. I bought it through a forwarding site called Neokyo. If you check out Neokyo you can search various JP sites to see if you can find a copy, but I don't see anything when searching the doujin name (おしおき!デイモンシスターズ) or artist name (はまなす茶屋).

You might get more help by asking in the buyfag thread.