Code Geass: Hangyaku no Lelouch

Synopsis

Kallen and Lelouch separately reflect upon the deaths of innocents in the Narita campaign, with both vowing to press on. Villetta questions Shirley on Lelouch's involvement with the Black Knights coaxing her to secretly follow Lelouch. There, she witnesses the battle between the Japan Liberation Front and the Britannian Army. Lelouch detonates 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 forcing him to eject and crash-lands near Shirley. She prepares to kill him to avenge her father, but hesitates when his mask falls off, revealing his identity to her. (Source: Wikipedia)