 If you liked
Mahou Shoujo Lyrical Nanoha: The Movie 1st
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 ...then you might like
Senki Zesshou Symphogear
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The Lyrical Nanoha franchise and Symphgear franchise runs the same heritage and vibes.
Mecha-ish henshin heroine, glorious fights, and indomitable determination of a powerful female protagonist.
The script writer of Symphogear also assisted in working on the two PSP games of Nanoha.