Cameraman: Metal Moth

This novel features many original worlds. There is no romance, and the characters aren't invincible. It's simply a journey taken by a few little people.

A virus turned humans into toilets with human heads. As humanity neared extinction, appliances with various computer bags perched on their heads were created, and war broke out.

The base is attacked, shattering the peace. Facing unknown enemies in an entirely new world, a squad transmigrates through time and travels between worlds, until they reach the end of their journey.

It's been reset (...).