Piyokokko is a circle that is quite, quite obsessed with series from JUMP
magazine. Not only has Yu Kiriko, the artist, done doujinshi or binsen for many of the popular JUMP series, she's also
done doujinshi devoted to JUMP overall. This isn't a new idea, but it certainly shows how much she likes the magazine.
Her artwork is very stylised and unique, sometimes quite nice, and sometimes a little strange. Personally I like her
later works better than her early ones. I'm always on the lookout for some of her Naruto djs. ^_^