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Tome of the Night Sky

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Tome of the Night Sky
Schwertkreuz and the Tome of the Night Sky
Device profile
Other namesBuch der Nachthimmel
MasterHayate Yagami
CreatorHayate Yagami
Magic systemAncient Belka
HandlingAuxiliary control
Japanese name夜天の書
(Yaten no Sho)
First app.A's manga (ch.7, epilogue)

The Tome of the Night Sky (夜天の書 Yaten no Sho, officially/Ger. Buch der Nachthimmel) is the Storage Device (being part of reprogrammed Reinforce) used by Hayate Yagami in the end of A's. It is also the new Storage Device she created post-A's and used in subsequent series, based on the design of the original one. Reinforce Zwei has created a similar Device called the Book of the Azure Sky.


Yaten no Sho (lit. Book of the Night Sky) is the simplified equivalent of its historical full name Yaten no Madōsho (夜天の魔導書, lit. Tome of the Night Sky), i.e. the original name of the Book of Darkness.

Note that "Buch der Nachthimmel" is not proper German, since "Himmel" ("Sky") is masculine and the name should therefore be "Buch des Nachthimmels". On the other hand, "Nachthimmel" can also be read as a plural ("Night Skies"), in which case the German name is grammatically correct.


The original Tome of the Night Sky, disregarding its corrupted history, appears in A's when Hayate sets up Reinforce for the first time.[1] It is later destroyed along with Reinforce.

The new Tome of the Night Sky which Hayate uses subsequent to A's first appears in the A's manga epilogue (in Nanoha's flashback). It makes its official appearance in StrikerS (ep.1). It also features in ViVid and Force.


Hayate uses it to store her spells, as opposed to actually casting or firing an attack (for which she uses Schwertkreuz).



  1. ^ The name of this then-storage-only tome is stated in Magical Girl Lyrical Nanoha A's, DVD Vol.6 Booklet (section: Ragnarok).

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