Makai Senki Disgaea 4

Valvatorez is a vampire who's sworn off drinking blood due to a promise he'd made in the past. The once great Tyrant is now a Prinny instructor in charge of reforming Prinnies into obeying their orders as instructed, who takes great pride in his work. Fuka Kazamatsuri is a girl from Earth who's died and is sent to hell as a Prinny in order to atone for her sins. However, instead of being completely turned into a Prinny, she kept her original appearance and was only given a Prinny hat and jacket...