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mahou_shoujo_lyrical_nanoha mahou_shoujo_lyrical_nanoha_strikers sentaro yagami_hayate

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Hum... Hayate use twin swords?
I think that's what you call artistic license ;) Like those few pics of arisa or suzuka with intelligent devices and barrier jackets (which are total awesome and should've been in the show).
IMHO, the crucifixes and the color of her swords look more of Chaos;Head than Nanoha.