One day, a hole opened up in the ground.
The gaping hole emitted an eerie, pale blue light, with no visible bottom.
Soon, monsters emerged from the hole.
You climbed into a combat vehicle and fought to prevent the monsters from escaping the walls.

Mission:
- Prevent the monsters from escaping the walls.
- Upgrade and enhance the weapons of the combat vehicle.

Weapons:
- Machine gun
- Missile
- Beam
- Close-range attack drone
- Electric shock attack drone

Effects:
- Increase vehicle speed
- Expand the range for coin and experience absorption
- Boost durability

Special:
- Coin acquisition
- Wall durability restoration

The battle to keep the monsters contained within the walls begins, all for the sake of humanity.