The Undying Princess Is a Sweet Devil.

Mary is a high class vampire who is bent in world domination & she can easily access all of the super natural mopho's that are regular threats to vampires; she perfectly sees herself as the ultimate queen.

The first thing in her agenda is transferring to a local school & brainwashing every person on it, in order to assemble a powerful army.... But there is one boy, Ippei; who doesn't seem to lose his free will when Mary orders him to.

At least, he doesn't go insane in the way that Mary would have hoped him to.