Taking place ten years after the events of Magical Girl Lyrical Nanoha A's, Nanoha, Fate and Hayate have joined the Time-Space Administration Bureau and form the Mất tích Property Riot Force 6. Joining them are four new magical recruits, Subaru Nakajima, Teana Lanster, Erio Mondial and Caro Ru Lushe. Together, they face up against the Jail Scaglietti, a dangerous criminal after the Mất tích Logia.Following Hayate's dream to make her own division that helps into all kind of disasters, including the Mất tích Logia cases, Fate and Nanoha including their own trainees, create Riot Force 6. Unfortunately not all can go as planned, because uncontrolled Mất tích Logia will get in the way of Riot Force 6 and is up to Nanoha, Fate and Hayate to deal with them while training their new trainees and helping with other tasks that arise along the way.