This movie exists to remind you why Nanoha stopped being subtle about what it is: a magical girl show that shoots harder than most mecha anime. The action sequences treat explosions like punctuation, the soundtrack swells at moments that should be quiet, and the camera never flinches. It's a franchise that finally stopped apologizing for spectacle and went full Michael Bay with a magical girl in the center of it. The story about Iris and Yuri's tragedy gets lost in the noise sometimes. What matters is that Detonation remembers Nanoha is fundamentally about two girls who solve their problems by making things explode together, and it commits to that with total visual conviction.

Kyrie Florian's reckless bid to save her father and the dying planet Eltria falls apart when her childhood friend Iris turns on her. The power Kyrie drew from Nanoha Takamachi and Earth's other defenders turns out to be of no use in helping her father, and Iris abandons her, now equipped to take revenge on Yuri Eberwein, a mighty being sleeping on Earth. Nanoha and her allies set out to stop Iris, learn the truth behind her feud with Yuri, and uncover the tragic history of Eltria's Planet Reclamation Committee, while a greater danger waits unseen. The film is an action-driven sci-fi magical girl story with comedy and drama.