Didn't You Expect That I Am the Mastermind Behind This!

Main world view - Girls' Frontline, Azur Lane. The protagonist carries the system and travels through another world. He who owns the entire gerand world's steel monsters will start his legendary dominance here. The protagonist of this book is not a virgin and insists on putting interests first. Cheating, maybe opening a harem, the superficial villains include sirens, deep sea, iron-blooded craftsmanship and heretics. The protagonist takes both black and white, so don't criticize if you don't like it. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.