Read the fan-translated version, "You're On Fire, Pen-chan."
Some of the jokes are a little corny (when they're not offensive) and the characters are pretty one-note, but I do feel like I'm getting smarter about Riichi/Reach Mahjong when I read it. The art is very distinctive too and old-school, appropriately for a Nobuyuki Fukumoto work from 1986.