|Season||Magical Girl Lyrical Nanoha A's|
|Airdate||November 26, 2005|
"Christmas Eve" (「クリスマス·イブ」 Kurisumasu Ibu) is episode 09 of Magical Girl Lyrical Nanoha A's. It was originally broadcast on November 26, 2005.
Chrono continues his research on the Book of Darkness. On Christmas Eve, Nanoha and Fate give Hayate a surprise visit, and encounter the Wolkenritter in the hospital room, learning of their connection to her. The groups fight that night on the hospital roof, but two masked men intervene, incapacitating Nanoha and Fate and draining the Wolkenritter's Linker Cores. Taking on Nanoha and Fate's appearance, they then summon Hayate to the roof and kill Vita in front of her to force her to awaken the Book of Darkness.