Half a year ago, tens of thousands of massive black shadow towers appeared all over the world, floating above cities. Chemists, physicists, religious leaders... all were at a loss.

Six months later, people got used to it and stopped paying attention.

One day, Brian Carter saw a flying insect crash into a shadowy black tower—it couldn't pass through.

The next day, a crisp, childlike voice made an announcement to all of humanity—

'Ding dong! On November 15, 2017, Earth has come online.'

Edward Foster × Brian Carter

The Three Iron Rules of the Black Tower—

① All explanations belong to the Black Tower.

② 6:00–18:00 is game time.

③ All players, please do your best to attack the tower.