The Decima's Unknown Maou Brother

He'd was sure he'd had died in that naval battle against the combined task force of Azure Lane being led by the commander herself. Against solely him and his Maou fleet of girls being a mix of Iron Blood, Sakura Empire, Vichiya Dominion, and Sardegna Empire. All of those who should be sunk before or didn't exist before 1945 came around(Slighlty Dark story/multi harems)