And she's completely right, the game wasn't even trying to pretend that it was a secret.
Also given her boss, Flonne, just casually reveals this "twist", not even realizing it WAS a secret. Said boss's identity is a bigger twistnote unless the player gets the Non Standard Gameover from losing to Artina, in which it is revealed she's working for Flonne and that Flonne is construction a giant robot, and the opening drops a hint. Honestly only Valvatorez is shocked by the reveal...
The Other Darrin: Prier and Zetta, switching from Richard Epcar to Patrick Seitz. In the Netherbattle Tournament, Adell and Asaginote Asagi's original voice actor provides her voice in the Post Game and the new battle dialogue for both Adell and HD Asagi's DLC releases use their original voice actors. Impressively, the rest of the returning characters retain their original voice actors.
How much Asagi falls under this trope is debatable. Her voice actress changes every game, which is mocked by Prinny 2's ads for Asagi Wars (She even comments in that game she "Has the same voice for the first time"