Casca was the only female soldier in the original Band of the Hawk and is behind only to Guts and Griffith in swordsmanship. Her ambivalent relationship to both of them makes her moody and capricious. Casca joins the Band of the Hawk after Griffith saves her from a sexual assault by a nobleman.

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After Griffith is imprisoned, she becomes the leader of the Band of the Hawk and, along with Guts, leads the mission to rescue Griffith.

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Upon arriving in Elfheim, Schierke and Farnese take it upon themselves to dive into Casca's mind and restore her mental state. They manage to get the old Casca back but at a price of her still not being able to see Guts, without reliving the Eclipse