Witch Craft Works : Episode 4

Current Episode Score: 6

So is his whole family witches, or just the sister. Or is that even his real sister, or just somebody who took over the sister role years ago to stay close to him? Honestly I just don’t have a clue with this show at all. I still don’t understand what is actually going on with it, everything just seems so random with me not understanding anything about the plot at all.