Z/X

Z/X (ゼクス, Zekusu), also known as Z/X Zillions of enemy X, is a Japanese collectible card game produced by Nippon Ichi Software and Broccoli. It is marketed as the first "free" collectible card game, with a free deck offered to players at card shops and events in Japan. A PlayStation 3 game titled Z/X Zillions of Enemy X: Zekkai no Crusade, developed by Nippon Ichi Software and produced by Broccoli was released in Japan on May 23, 2013. A manga adaptation written by Broccoli with art by Karegashi Tsuchiya began serialization in Shueisha's V Jump from September 2012. A 12-episode anime television series adaptation aired between January 9 and March 27, 2014.

Plot
The anime story is set in the not-so-distant future. Five "Black Points" suddenly appeared around the world as portals to parallel worlds. Immediately after, strange creatures began their invasion from these portals. These creatures are the inhabitants of five worlds—the same worlds in different timeframes. In order to ensure their own future timeframe survives, each of the five invasion forces battle to wipe the other future timeframes out. The key is one card-shaped device.