After Anybody360 posted https://e-hentai.org/g/766818/347481772c, I decided to translate it and the other Dekkai-chan manga on the author's Pixiv page. So this is a collection of all the Dekkai-chan material I could find.
If you have more Dekkai-chan material or know where to find the full swimsuit comic, please let me know and I'll translate and add them.
The author Hata Hata is making a new work, Yoru no Dekkai-chan, for the next Comiket. If it goes online I will translate it (provided someone buys and uploads it of course).