Shirley at Gunpoint
Kallen and Lelouch separately reflect upon the deaths of innocents in the Narita campaign. Shirley secretly follows Lelouch and witnesses the battle between the Japan Liberation Front and the Britannian Army, which Lelouch ends by detonating the Japan Liberation Front freighter as the Britannian Knightmares begin to board it, killing all personnel on board and giving the Black Knights the element of surprise. Suzaku attacks Lelouch, easily overpowering his weaker Burai with the Lancelot, forcing him to eject. He crash-lands near Shirley and is knocked unconscious. Shirley prepares to kill him to avenge her father, but hesitates when his mask falls off, revealing to her that Zero is Lelouch.
Aired 12/01/2007EP 13 - Shirley at Gunpoint

Code Geass: Lelouch of the Rebellion
On August 10th of the year 2010 the Holy Empire of Britannia began a campaign of conquest, its sights set on Japan. Operations were completed in one month thanks to Britannia's deployment of new mobile humanoid armor vehicles dubbed Knightmare Frames. Japan's rights and identity were stripped away, the once proud nation now referred to as Area 11. Its citizens, Elevens, are forced to scratch out a living while the Britannian aristocracy lives comfortably within their settlements. Pockets of resistance appear throughout Area 11, working towards independence for Japan.
Lelouch, an exiled Imperial Prince of Britannia posing as a student, finds himself in the heart of the ongoing conflict for the island nation. Through a chance meeting with a mysterious girl named C.C., Lelouch gains his Geass, the power of the king. Now endowed with absolute dominance over any person, Lelouch may finally realize his goal of bringing down Britannia from within!
(Source: Bandai Entertainment)