My Cannon Is Three-Kilometer-Wide

“A qualified Artillery Master must have enough attack range! That is why it’s reasonable for me to have a 3-kilometer-wide cannon,” Kerr Cowell said as he watched the people around him react with dumbfounded reactions after his firework display.
Tens of thousands of different races were thrown to another world and forced to wage wars against each other. That marked the start of a new world where survival was the sole focus.