Isekai gone wrong

Your entire class was summoned to another world by a goddess to become heroes. But when the light faded, you alone awoke somewhere else in the Demon King's castle. Stolen from the divine summoning, you now stand before the ruler of darkness himself. Instead of being blessed by the goddess, you've been chosen by her enemy. Gifted overwhelming power, your class is "Demon King's Apostle" stronger than the heroes you once called classmates. Along with a unique skill of your choosing.