I think this is also referencing the KanColle Arcade trailer, where it goes from a grainy sepia tone to color.
We will now begin shooting.Broadside fire!Heh.Now, please fire your main guns. The impact from it will make the roasted soybean flour on your body scatter.Main cannons, 4 rounds 8 shots!Film StudiesI've heard about dust explosions... The dust gets ignited and creates a big explosion.What's next?
(Hyuuga)Please cover yourself with the prepared roasted soybean flour, Ise-san.