@anon3213 It's very easy. The editor must have somehow turned some of the pages into greyscale during editing process, could have been mistakes or whatever.
I can't believe Crimson is still going strong. You can tell the art style is still similar to the 2000s mangaka: a bit of Berserk, Gantz, Fairy Tail, HxH, FMA, Naruto, etc
Is it just me who think that the muscular golem is the best one drawn? Because after years of reading hentai, I find Crimson's female body (yep, only 1 slender type of body, no other variants) not arousing at all. Let alone the face expressions and orgasm effects. Why couldn't I see any improvements of Crimson's work for nearly 10 years?