At the end of season 6 of Ninjago, something unexpected happened causing the ninja and wu to be teleported to sonic's realm and meeting the beloved hedgehog and his friends, and then they meet with their new enemies, who are to going to change the flow of the story and in the middle of the a fight between the two sides the heroes end up end up in the world of danmachi. follow the ninja and sonic's crew as they try to figure out how to return to their homes and defeat their enemies as a side objective.