>>Hakrei
Most likely because e-hentai's gallery is rendering a low-res image for you, as the upload is 166.6MB; The full resolution gallery is more vibrant and crisp. Although there is a possibility that Kantoku is taking a more relaxed sessions in his doujin work as he has more professional workloads, I personally don't feel that his art became less in style (in terms of quality of anatomy and lines). Kinda sad that he doesn't do any ero/adult doujin though, and maybe because of that he doesn't do more unique poses for his girls.

Edit: Inspecting the scan again it does seem that some of the lines are indeed blurry, although this could be due to the brush Kantoku uses for the lines or a lower quality print job (assuming this isn't a digital format, and the scanner didn't do an auto filter or any weird converting process.) One strange thing is that the text also seem to be blurry too at 600 dpi, so it could be that Kantoku uploaded lower resolution for the printer.

Last edited on 30 December 2018, 21:00 UTC.

Base +15, Inuyan +7, mystgourmet +6, th3divineone +6

(C95) [5年目の放課後 (カントク)] シタギスキマ
https://www.melonbooks.co.jp/detail/detail.php?product_id=447874

Base +7, Inuyan +7, mystgourmet +6

https://www.doujinshi.org/book/1635628/

Base +57, SoulLuna +6