User blog:Staraptor Kwan/Why are some of the main characters living alone?

It's been upon my mind for some time now; if I'm correct, a ordinary dorm room for students at Yotsuboshi Gakuen is built to house two students each, right? After all, we know that Yume and Koharu are currently staying together since they have a bunk bed for sleeping. But the question is, why is it that Laura, Ako and Mahiru are shown living alone in their dorms without any roommate to speak of? As far as I know, the only ones who have their own private bedrooms at Yotsuboshi Gakuen are those of the S4, which makes sense given that they live in a huge castle.

For example, in Episode 7 we saw that Laura was living alone. Then it was same as well with Mahiru in Episode 15, with Episode 17 revealing that Ako lived alone as well. The question is, why? It wouldn't make any sense (other than for storyline purposes) for those three to be living alone unlike Yume and Koharu. I mean, it would have been a rather fun scenario if Mahiru and Ako were roommates: the former would have been very tired of her roommate's constant obsession over Subaru and the latter would have been annoyed by the former's reluctance to have any sort of conversation with her.

If anyone has a theory as to why those three are living alone, please leave a comment down below.