Rosario+Vampire.
It's the bee's knees. The Bishop's knickers. The Dog's wag.
The best School/Supernatural manga I've had the pleasure of reading, and one of the best romances to witness. Period.
Characters are silly, young, and foolish. Full of errors and make many mistakes, just like many kids their age. But as the author's drawing skill improves and as the plot deepens, you really get a sense of a coming of age, a growth of maturity, of perspective. Not only is this visible in how the characters think, but also how they act and treat one another. It is a treat to see how this group of friends form and grow close to one another, how they face challenges together, and how this carries onto the next series.
The plot? Appears to be simple, but is an amazingly delivered, each arc passing the torch with ease and realism. The escalation is crazily well done, starting off with dispatching delinquents before culminating into genuine threats. After the main engine of the story kicks in, every chapter is relevant. There are no filler chapters. No brakes.
The romance? Amazing. The subtle cues revolving the principle heroine, Moka, both Inner and Outer, and her relationship with the protagonist Tsukune are amazing for the setting, and demand you to  follow through into the next installment of the series to witness the continuation of their relationship. Not restricted to Moka, however: The confessions, introspections, and heartfelt conversations that occur are juvenile and moments of epiphanies, where characters reconcile. Each situation is different, although often stemming from anxiety and other feelings related to insecurity.
As a reader who has followed this series update by update to its current state, I highly recommend this manga to the young and restless, for a relatable experience and story about acceptance, friendship, and bravery. It is my favorite manga, because unlike any other manga I have read, you will relate to one of these characters. And through this story you will stand witness to how they struggle and triumph over their own flaws and the challenges that they face.
Enjoy one of the best mangas created so far in the century. I know you will.