A young man was summoned with his class to another world, such a feat conceived by a Goddess, the young men were summoned as heroes to protect that world. This goddess shows them a kind of panel which is called the System, his role would be to help them understand this world without worries. But the system of one of them, Gabriel, has numerous errors, and as a goddess, she decides to discard it, little did she know with whom she spoke. In the end, the boy was taken to a kind of dungeon, where he promised himself to leave there and become the strongest in that world!