Iconoclast!

Five girls kneel before high schooler Kashiba Shougo, calling him their Messiah. Shougo and his childhood friend Karin are suddenly taken from their normal lives into another dimension. The girls are known as "Maiden Princess." One of them, Mellini, explains that a god's curse has drastically reduced the world's population. Only someone not created by the god—someone from another world—can stand against the god's subordinates, who carry out the curse. Shougo must witness the deaths of many people. He chooses to fight, determined to stop the gods as the "Iconoclast."