|Season||Magical Girl Lyrical Nanoha StrikerS|
|Airdate||April 22, 2007|
"First Alert" (「ファースト·アラート」 Fāsuto Arāto) is episode 04 of Magical Girl Lyrical Nanoha StrikerS. It was originally broadcast on April 22, 2007.
Subaru, Teana, Caro, and Erio are still enduring hard training with Nanoha, but soon their training will be complete. They are given new upgrades to their Devices and the Limiters are explained to them. Afterwards, the Riot Force 6 must act on their first mission.