Support the author and read the official scanlations here: https://read.futekiya.com/comic/5e33d84487221
Vol. 3 is completed and it seems like the English version of vol. 4 should come out sometime this year :)
For now, you can find the raws for vol. 4 ch. 1 here: https://www.cmoa.jp/bib/speedreader/speed.html?cid=0000195958_jp_0001&u0=1&u1=0&rurl= https%3A%2F%2Fwww.cmoa.jp%2Ftitle%2F195958%2Fvol%2F4%2F
Raws for vol. 4 ch. 1 can also be read here without needing to log in: https://booklive.jp/bviewer/s/?cid=726227_001&rurl= https%3A%2F%2Fbooklive.jp%2Fproduct%2Findex%2Ftitle_id%2F726227%2Fvol_no%2F001
There's a sequel to this called Takane no Hana wa Midasaretai.
The raws can be purchased here: https://www.cmoa.jp/title/240855/