From the "Code Geass: Lelouch of the Rebellion - Kiseki no Birthday" DVD/BluRay. It is different from the 9 Omake Flash specials included in the Code Geass R2 DVD/BluRay.
Genres: Supernatural
Watch Code Geass: Hangyaku no Lelouch - Kiseki no BABA Gekijou episode 1 online — subbed and dubbed, with automatic AniList / MyAnimeList progress sync.