Full Clearing Another World under a Goddess with Zero Believers: Volume 4 by Isle Osaki

Makoto Takatsuki and his friends have saved Roses and are now headed to the most prosperous nation on the continent—Highland. They soon arrive in the capital, Symphonia, and despite its grandeur, the city is a hotbed of race and class inequality. When the group bumps into the actively hostile Hero of Lightning, Makoto must weather a vicious battle while simultaneously navigating the limitations of uncontrolled elemental magic. Meanwhile, the Snake Sect is plotting an attack on Symphonia, but the scheme runs deeper than anyone expected: the ruined nation of Laphroaig, which is inhabited by servants of the Great Demon Lord, has become a fierce shadowy presence that lurks beneath the apparent riches of Highland. With our heroes caught in a deadlock against imminent destruction, aid comes from an unlikely place—the cursed moon priestess of Laphroaig?! Can Makoto trust this exiled priestess and save humanity from being overrun by demons?