Lelouch Lamperouge finds himself caught in a clash between an anti-government terrorist group and the Britannian army. When things take a turn from bad to worse, a mysterious green-haired girl bestows a dangerous power upon him, changing his life forever.

After confronting Prince Clovis, Lelouch learns information about his mother's murder. Back at school, he is surprised to find that one of the terrorists he worked with is a fellow classmate. But when he confronts her, he finds the limits of his new power.