In a daring bid to rescue her father and save her ailing planet Eltria, Kyrie Florian finds herself betrayed by her childhood friend, Iris. Despite harnessing powers from Earth protectors like Nanoha Takamachi, Kyrie is unable to aid her father due to unforeseen circumstances. Left in despair by Iris, who seeks vengeance against the slumbering Yuri Eberwein on Earth, Kyrie's allies led by Nanoha must confront Iris to unearth the truth and quell the conflict. Yet, as battles escalate, a more ominous threat looms. Undeterred, Nanoha valiantly uses her magic to aid those in distress, unwavering in the face of adversity.