Did they badly convert full color images to greyscale and then print it on low quality paper or something? This just looks oddly dark and low quality.

Base +45, JJ1995 +14, LoliShin +6, Megaton +39, Gentleman Chimera +7, JFK_360_Noscope +12

@Dynellen
In a sense, yes.
All the works in this tankobon were originally full-color digital comics. (for example, the first story is from here: /g/822305/5d9ffcdaa0/)
Printing full-color comics directly into black and white may not work well enough, but I guess there is no better way......

Base +8

The digital version also did the same.
/g/1179936/2fe93b104e/
This is probably has something to do about censorship, I guess.
For small publishers, they usually use mosaic for full color stuffs and use black bar for B&W.

Base +7