Bahamut Revenge

This story tells the story of a man that was reincarnated to another world and was given a new name Erebus. In his new life he was given a mission. His given mission gives him a new purpose in life. With this new purpose he set on adventure in that world. As the prince that will be the next king of the world and his mission, he was shoved with responsibiliy that he never had in his world before. How will his story unfold ?