The story appears to be centered on the investigation of the Book of the Silver Cross, an ancient Belkan magical tome. Tohma Avenir, whilst travelling, discovers a girl named Lily Strosek trapped inside a construct. When rescuing her, she gives Tohma an amulet that gives him access to a new Device power. However, unbeknownst to them, there is another with a similar Device causing massive damage and injury, leading to an investigation by the Time Space Administration Bureau.
Mahou Senki Lyrical Nanoha Force
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