In this third volume of Rosario + Vampire, things take a dramatic turn in terms of the overarching plot. Namely, the manga changes in that it actually has a plot now. Before now, the whole series has been mostly a “monster of the week” style of adventures, wherein the various enemies and supporting protagonists were introduced into the world of Yokai Academy.
Now, things are changing, as actual story arcs are being introduced, and various plot devices that will bear fruit later on have come up in the stories. This is a good thing, but also a bad thing.
You see, the charm of the manga series has always been it's light-hearted slice of life story format. Seeing the adventure of Tsukune and Moka and their friends as they have one zany escapade after another was the draw to this series. This hasn't been eliminated yet so much as it is slowly being altered to introduce more myth arcs to Rosario. Personally, I'm all for having some interesting plots that are more, shall we say, epic, but this only goes so far. I don't want the series to lose it's fun and take itself too dramatically seriously. This should remain a fun series, not become some heavily emotional drama.
Despite the uncertainty I have about the above possible changes, I have to say that the character development is really quite interesting. The students that before didn't like, or else barely tolerated, each other, are now more friendly towards each other, and the growth of this group of friends from adversaries to allies to close friends is touching and fun to watch.
This volume is an interesting continuation to the Rosario universe, and I can't wait to read more stories.