We already had a prequel episode but here's an even more prequel one. It's a look at how the girls first got their dorm and decided sleeping in the same bed. The apartment they got for while they're at school is this real run down place that doesn't even look like a proper dorm and has a convenience store under it. The blonde sister cheers the other up and they go get ice cream. I liked the interaction between them for the most part. It was a cute little episode about making the best of what looked like a bad situation. It's soured a bit bythe weird incest and love triangle plot this story leads into, if this was just a short special in isolation I think it'd be great. So... 6/10 I guess