13 players are locked inside an abandoned building, each with a PDA representing a playing card from A to K and a collar device set around their necks. Each of the 13 PDAs correspond to a different set of objectives, and if a player doesn't fulfill their PDA's objectives in 72 hours, their collar will explode.

A missing persons case is dumped onto Shugo one day. Yura... the girl he had an intimate relationship with before being sent to war. But he soons finds out she's not the only one missing.

Yamato met an old man called the Memory Collector, who could grant any wish in exchange for one's memories. Yamato wished to become a Stryker, the hero from a manga he loved. Several years later, the only person who can save the Balbora Empire is the hero of the manga Dengeki Stryker.