Yes, I just found out about it a week ago. I bought the first two volumes and read them in about an hour or so. It's pretty good so far, but not incredible. I will probably pick up the rest of the volumes that are out. To me, it is worth that much.
It doesn't really read like a manga to me, but then, the only real manga exposure I've had is Rurouni Kenshin, Fushigi Yugi, and Kare Kano. It reads more like a Focus on the Family cartoon or something. Each one has one major incident in it, as the focal point of the volume, that teaches the main character something about responsibility.
The main character is not a Christian, but the books are telling the story of how the Christians around her loving her, make her become one. She doesn't get along with her mother, she's been in jail before, she loves to cause trouble, steal, lie, cheat, everything. She especially loves annoying the Christians. But they are trying really hard to love her in spite of all that. The truth is, she really thinks no one loves her or ever could.
It's really not a bad story at all, it's just, like I said, nothing incredible.
I actually bought it originally for research purposes, as I am working on a Christian manga of my own. Wanted to make sure my story wasn't the same, and see how someone else made a Christian manga.
Hope that tells you a little something about Serenity. The web address is
http://www.serenitybuzz.com.
Dyzzi