When Alisia Dragoon was just a little girl, she watched her father being tortured and killed in front of her. For some reason, she was allowed to leave, grow up and somehow swallow a Tesla coil in order to seek her revenge through electrical zappy death. Or at least that's the amount of plot that is needed to understand this game.
This run zaps through the game, quickly frying everything in Alisia's path to nothingness.