Otome Game Sekai wa Mob ni Kibishii Sekai desu (Republic Arc)

Synopsis:

Although Leon once rescued the kingdom—and even the entire world—from disaster, Marie reveals that the story doesn’t end there; the game has a sequel. If similar events to those Marie set in motion occur within the Republic, the world may face another looming catastrophe. Determined to stop history from repeating itself, Leon, Marie, and their companions head to the Republic of Alzer as exchange students—but what awaits them next…!?