Here, she begins to call herself Frederica Bernkastel, with "Frederica" being a corruption of her own name and "Bernkastel" derived from the Bernkasteler brand of wine she is so fond of. "Furude Rika" in katakana [フルデリカ] is one character off from "Frederica" [フレデリカ]. Saikoroshi is the very first arc in which Rika has explicitly referred to herself by this name in the narrative.