Hilariously (and by that, I mean in a way that would make her friends scream), Grune's reaction to learning that Grell is a psychopath was to try to be her friend even harder. Because obviously she just needs a good example, right? (Good thing Grell's mellowed out considerably in Luceti now.)

And neither does Grune. Poor Fenimore, though, is a very normal girl, and so she's a little less chill about that sort of thing.... XD