Negima!? Magister Negi Magi

There’s a Bastard Who Gets All Happy With Secrets, Then Reveals Them, and It Really Pisses Me Off. Chiu-Chiu Is Going to Get Angry Too! Really Mad! (1x18)

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The Black Rose Baron's identity has been revealed and all of Class 3-A knows it except that the Black Rose Baron doesn't know that the class knows. Konoka and the others decided to keep their knowledge of it a secret from him but will they be able to stop Asuna's big mouth from blowing their cover?