The human body has defenses in the form of an immune system to deal with bacterial infections, viral invasions, and the like in the microscopic world.
The Insect Swarm also possessed such a line of defense: a Nano-Insect defense system centered around Nano Kikaichu. In nature, it was difficult to encounter an opponent capable of challenging it.
The difficult part was locking onto pathogens. In nature, pathogens with simple structures could not defeat the Nano Kikaichu themselves.
Thus, whenever she encountered some unknown disease, Mimi usually had to identify the culprit from among the countless bacteria before carrying out a precise purge.
This meant that the Nano Kikaichu's performance was already sufficient, so there was no need to develop stronger killing capabilities.
As a result, they were inferior to the metal Nano Puppet Insects in direct combat ability.
And once the defensive line collapsed, figures dissolved and melted one after another beneath the devouring Iron Sand amid the drifting Black Mist, collapsing and weathering away like sand towers.
The Iron Sand Puppet Insects surged in like a tidal wave, burrowing into human bodies and destroying their cellular structures.
Amid the erupting screams, one figure after another spewed Iron Sand and fell to the ground. As their cellular structures disintegrated and collapsed, the dead could not leave behind complete human forms, only pools of horrifying crimson blood.
The troops on the first defensive line were finished.
"Konoha is nothing special after all," Chiyo said.
Mimi looked toward Chiyo.
"Your subordinates are dying in droves. Aren't you going to save them?" Chiyo continued.
This woman talks too much.
"What a heartless goddess," Chiyo said. "To test for weaknesses, you send them to their deaths without the slightest mercy."
"No matter how you test it, it will all be a waste of effort."