Z/X Encyclopedia (数えきれないZ/X用語 Kazoekirenai Zekusu Yōgo, literally means "Incountable Z/X Terminology"), also known as Z/A - Zillions of encyclopediA, is the official database for Z/X related terminology.

In the future not so far from now, the world will be dragged into an intense battle.
A lot of new words, starting with "Z/X", will be born there.
Do you want to turn the knowledge into power and be prepared for the incoming battle?
If you think that you want to survive.............

The Z/X Encyclopedia contains explanation about various terminologies that appear in the story of Z/X. As of 27 May 2019, it hold 150 entries.

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