From the introduction:
The Magical Fury Companion is a collection of new material for Magical Fury, adding new options and expanding the world and especially the youma who threaten it.
Rules Options: Including new moves and the dangerous "Overdrive" power that briefly grants magical girls enormous power at a high price.'
Character Options: Bonds that define a magical girl's relationships and drives, and options for defining her costume and magical weapon.
Tsukaima: Details on the possibly sinister little mascot creatures who act as mentors to magical girls.
Youma: More details on the monsters that magical girls fight, including special abilities, and tables to develop their looks, magic, and motivations.
Secrets: A collection of suggestions for the sinister shocks at the heart of the world, and how to use them in your campaign.