National Tower Defense, My Initial Type of Troops is Dart Monkey

With Earth's resources depleted, the only way to survive is to enter the astral plane and collect resources.

However, each time they gather resources, they are attacked by various monsters.

In order to protect production facilities, humanity has entered the era of universal tower defense.

All adult citizens can obtain the Myriad Races Barracks and summon other races to come to their aid.

Train them to engage in production, transport goods, or use their military force to become tower defense specialists, climb the city walls, and safeguard the peace of the region!

Zuo Yu has been in this world for three years.

On the day the Multiverse Barracks were acquired, a useless little monkey with an F rating emerged from the barracks.

To this day, no one knows its upgrade path, and all research institutions consider it scrap.

But this monkey awakened Zuo Yu's distant memories. With a heart full of trepidation, he bought a dart and placed it in the monkey's hand.

Bang bang bang bang!

The skillful throwing motion and perfect accuracy convinced Zuo Yu that this guy was from the Balloon Tower Defense!

Magic Monkey, Ninja Monkey, Sniper Monkey, Super Monkey King...

Demons? They're far more powerful than you balloons; I've already blown up countless of them!