Regina is a teacher who enjoys inappropriately touching and (eventually) molesting her female students. She does this under the "guise" of teaching how people react differently to attraction. While one of them Melissa, is perfectly fine with this treatment, the rest - such as heroine Zoe - do not like it at all. When Zoe resists her advances, Regina humiliates her in front of the whole school, claiming that the girl is not comfortable in her own skin.
As it so happens, Zoe becomes cursed with the protection of the titular gnome who takes it upon himself to get revenge by slicing off both of Regina's hands before finally killing her.