CTIA's storyline is rooted in an ancient organization known as Rosenkreuz. The Rosenkreuz wants to reform the world to their ideal. For centuries, the Rosenkreuz had worked in secret. But the girls haven't an inkling of Rosenkreuz's existence, and how big a part it plays in their lives. This causes a lot of plot twists, and some of the concepts presented border on the philosophical realm.
Character development is sufficient.
The art and animation are generally cutesy in style. All the female villains are extremely well-endowed. They seem just about ready to burst from their already revealing outfits. There are definitely some good songs in the soundtrack. I especially like the ending theme.