Tome of the Night Sky
Yaten no Sho
Device profile
Other namesBuch der Nachthimmel
MasterHayate Yagami
CreatorHayate Yagami (recreated)
Magic systemAncient Belka
HandlingAuxiliary control
Japanese name夜天の書
(Yaten no Sho)
First app.A's (ep.11) (original)
StrikerS (ep.1) (recreated)

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 creates post-A's based on the design of the original one, and uses in the subsequent series. Prior to this creation, Hayate co-uses with Reinforce Zwei a similar Storage Device named the Book of the Azure Sky, which is solely used by Rein after the Tome is recreated.


Yaten no Sho (lit. Book of the Night Sky) is the simplified name 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 as the Book of Darkness, appears in A's (ep.11-13) since Hayate reprograms and sets up Reinforce.[1] It is later destroyed along with Reinforce. It also appears in Nanoha's flashback in A's manga (ch.7).

The recreated Tome of the Night Sky which Hayate uses subsequent to A's appears in StrikerS manga, StrikerS, ViVid and Force. It is created in the autumn of 0069 based on the design of the original one.

Alternate continuitiesEdit

In the movie continuity, the original Tome only appears in The MOVIE 2nd A's. The recreated Tome appears in Reflection (summer of 0067), chronologically earlier than its creation in the primary continuity.


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, Magic Dictionary (entry: Ragnarok).

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