Ooh, frame story for the fleet girls. Anyone with more knowledge of Kancolle know if this is canonical?
Nope, fan supposition. There's literally nothing known about the plot, just you and your ship girls going further and further afield from your base, leveling as you go, until you finally hit an enemy anchorage/base (world 4 and 5).
"Hey, Bob, check this out. If you reverse the polarity here, even guys can fire the special weapon!"
"Yeah, I figured that out last week but kept quiet about it. Do you really want to turn the navy back into a sausage-fest?"
"Good point. I'll go destroy my prototype."
Please at least let this part be canon XD
A Destroyer's Destiny 28Mankind's territory was rapidly shrinking.Classified intelligenceAfter a thorough dissection and analysis, weapons which were effective against these creatures were quickly developed.This was the birth of the "fleet girls".A few decades ago, mysterious sub-creatures emerged out of the oceans and started attacking many countries around the world.To be continued on next time "Mankind's counterattack"There were many tragedies and many lives were lost.Furthermore, the reason why males cannot utilize these weapons depends on the results of on-going research.The navies counterattacked with their full force but conventional weapons were completely ineffective against these sub-creatures.However, it was determined that only females can use these special weapons.
Those who were found to be compatible were quickly drafted.However, the tide of war changed when a sub-creature was captured.