After graduating from their studies following the 'Book of Darkness' incident, veteran mages Nanoha Takamachi, Fate Testarossa, and Hayate Yagami serve as military operatives for the Time-Space Administration Bureau on planet Midchilda. When a harrowing airport fire goes unnoticed, Hayate initiates the creation of Riot Force 6, an elite squad tasked with safeguarding public welfare and handling dangerous mystical artifacts called Lost Logia. Alongside fresh recruits Subaru Nakajima, Teana Lanster, Caro Ru Lushe, and Erio Mondial, the trio faces rigorous training, personal growth, and relentless challenges. Despite their dedication, combating adversaries exploiting the Lost Logia and navigating internal conflicts within the Bureau push Riot Force 6 to its limits.