In the neon-lit city of Kyre, crime runs deep, and a mysterious underground organization known as The Echo Syndicate controls everything. People disappear overnight, leaving behind only one trace—a distorted radio signal repeating their final words.

Rei Azuma, a rogue detective, has spent years chasing Echo, but every lead goes cold. That is… until one day, he receives a signal that shouldn’t exist—his own voice screaming for help.

The problem? He has never been kidnapped.

As Rei follows the clues, he is ambushed and wakes up chained in a dark room, surrounded by twelve strangers—each one claiming they were kidnapped the same way. The only rule in this twisted game? One of them is the kidnapper.