This was tagged as Kallen Kaslana before due to the manga Evanescia is reading. The manga in question is actually The Gratitude Arc (pages 23 and 24), and it features Theresa Apocalypse (who is a clone of Kallen and thus has a strong resemblance to her, though the height difference should have been a giveaway).

I know a tag changelog isn't exactly necessary but I felt the need to make the distinction so someone doesn't come by and revert it.