Code Geass: The Miraculous Birthday

Code Geass: The Miraculous Birthday, (コードギアス キセキの誕生日, Kōdo Giasu Kiseki no Tanjōbi) is a half-hour long picture drama.

Plot
After the events of Code Geass R2, Ashford Academy prepares for yet another school festival. Lelouch and his friends reunite for one last adventure to help prepare for the festival and soon find themsleves stopping a terroist attack on the school. In the end the student council succeeds and Lelouch bids his final farewell to his beloved friends, this being his final gift to them, and dissapears, along with C.C., Rolo, and Shirley. The remaining members realize this miracle is possible on that particular day, December 5th...Lelouch's birthday.