After solving the incident of the scattered Jewel Seeds, Nanoha Takamachi happily returns to her everyday life, though now with added magic practice in the morning. Exchanging video messages with Fate Testarossa and the crew of the Arthra, Nanoha eagerly awaits the chance to speak with them in person again. But while studying in her room one day, Raising Heart suddenly calls out to Nanoha and warns her of an incoming attack!
The attacker is a young girl named Vita, who calls herself a Belka Knight. She proves her strength by using an intelligent device with a mysterious cartridge system to quickly overwhelm Nanoha. Luckily, the Space-Time Administration Bureau is able to step in before she is completely crushed. Vita and her fellow knights Shamal, Signum, and Zafila are on a mission to steal magical power from mages in order to complete the Book of Darkness, one of the Lost Logia. For what sinister purpose are the knights after this Book of Darkness?+ More
Characters & Voice Actors

Shamal
Main
Yuzuki, Ryouka
Japanese
Signum
Main
Shimizu, Kaori
Japanese
Takamachi, Nanoha
Main
Tamura, Yukari
Japanese
Testarossa, Fate
Main
Mizuki, Nana
Japanese
Vita
Main
Sanada, Asami
Japanese
Yagami, Hayate
Main
Ueda, Kana
JapaneseRecommended for you
Ame-iro Cocoa: Side G
TV
2m
Chargeman Ken!
TV
6m
Art of Fighting
OVA
49m
Ame-Con!!
TV
2m
Crane Game Girls Galaxy
TV
13m
Ketsuekigata-kun! Featuring Yuri & Nasuno
Special
2m
Rainy Cocoa in Hawaii
TV
2m
Arcade Gamer Fubuki Extra
Special
6m
Katsugeki Shoujo Tanteidan
OVA
26m
B.B. Fish
OVA
29m
Rainy Cocoa
TV
2m
Conception
TV
23m
Apocalypse Zero
OVA
37m
Papillon Rose
TV
25m
JK-MESHI!
TV
3m
Captain of Cosmos
Movie
80m