The Komainu is Nevekari's best AA weapon in their arsenal. It can destroy Capital ships and aerofighters with ease, and combined with the smaller AA support turret, it can leave ships in flames, and fighters as junk.
About this creation
The dude in the seat turns, lowers and raises the cannon, while the guy on the side picks targets to destroy.
The cannon is powered by an energy cell and fires a giant beam like this:
It doesn't spin like that (only cuz that dude is being stupid). Another thing is that you do not want to stare down the barrel.
This is the small support turret that main purpose is providing some support fire, and for getting rid of any fighters that come too close to the ground.
Another pic of the turret.