Okay, we're back in the private study room, and now we find out what's up with the seventh witch. It turns out that she's not a fan of the student council, so they're going to have to find a way to get her on the side of the school's witch-fighting team. The seventh witch is super excited to see her, but she doesn't know what to do with herself. She's super bummed that she can't get her revenge on the school witch team, because she thinks she'll be remembered for a long time. Okay, now we get a little more info about her: she looks like a school student, and she has the power to erase people's memories. She can do whatever she wants with her power, so long as it's done in a way that won't cause her to be remembered by anyone else. So, she wants to get rid of her mem, which basically means she can erase anyone's memory. She wants to make sure that no one forgets about her by using her power on a school witch.