In Another World with My Smartphone, Vol. 13 (manga)

In order to protect everyone from the Phrase (and get to pilot an even cooler frame gear), Touya sets about upgrading his nation's defenses, saving girls and taking out monsters along the way. But as word spreads of the frame gears and a mysterious girl enters the picture, things start to get more complicated-and dangerous. On top of that, when the God of Love makes a surprise appearance, Touya's brides may find out just how many more will join their ranks...