Extreme Contract

Extreme Contract (極契約; kyoku-keiyaku) is a family introduced in BS65, possessed by the Contract Card, The Extreme Partner, Zetter, and the Holies family cards with Contract Advent that support Zetter. At the same time, it is also owned by Contract Card, Star Buddy, Mugen, and its Incarnate family cards with Contract Advent that support Mugen. 
The name, 極契約, most probably references the nature of the two decks being an Ultimate (究極) deck, and especially on how Mugen represents the beginning of Ultimates. In the lore, Zetter is created as a final hope to defeat the Evil God with its ultimate power, and has an upgrade form called The ExtremeDivineStar Neo-Zetter, which takes "extreme (極限)" as its title, and calls back to the family name. The current family name is picked instead of "ultimate contract" based on that and to avoid confusions of using the name of the card type, Ultimate, as a family name. 
== Also See: ==
* List of "Extreme Contract" family cards
Category:Family