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There used to be a time when Crystal would never approach another student on her own, be it someone from her own class or even the one sharing the same bench.
In the rare case that she did happen to do so, it would only be to relay instructions from the teacher, and that too only if they were insensitive enough to disturb their top student to do such a mundane thing.
Even though this fact didn't hold true anymore due to the changes brought forth by Emilia's influence in her life, Crystal still preferred to keep to herself, and rarely interacted with her peers.
For her to do so today for Randy, an ex-classmate who had already moved to a different class, she clearly had an objective. And that, of course, was to make it crystal clear to the boy that he would never, ever, be able to get together with Emilia.