OPUS is a story-driven action RPG in the winter post-apocalyptic world. Two survivors of the plague are on a mission to launch a rocket that will return the deceased to their cosmic homeland through an ancient tradition of space burials. The story unfolds in the snowy land and frozen mountains of post-apocalyptic winter, where they must gather all the necessary materials for their rocket launch.

Travel across the winter land, through burnt down ruins and treacherous peaks. The snow is still full of frozen remains from the time of the plague. But it is there where you will find the first sign of life! A fire and an abandoned building left behind by the plague. The first step in your quest is to find out what happened here. With the help of an old man, you will find out the truth about the former inhabitants. A man and a woman survived the plague and decided to stay behind, leaving a place where they were born. A place where they would spend their life together and raise a family. And in the end, it is a place where they will also be buried.