This is the RAW digital version of the doujinshi which you can get only through the artist's pixiv FANBOX. I am planning to upload all digital doujinshis of the artist as they get uploaded.
It happens at times that they only release their low quality to fantia and fanbox members might be cause of site restrictions when they could just use .rar files or .zip
@Addelheim Yeah it truly is a bummer that the artist only provides low resolution pages for his douijnshis. I've asked him about giving the PSD files but the response was that he can only give 3 pages as PSD.