Back in the day, Kanami and Elsia found themselves in a house that had once burned down. They played there for a long time until an incident happened - Kanami started falling through a rotten tree and could barely hold on to a piece of torn rubber with one hand. There was no way Elsia could help her, and then a modern-day knight came to their rescue and saved Kanami. They promised each other that when they grew up they would be knights to help those in need. Years later, they grew up and went to an academy where knights are trained. But after all, knights are both men and women and they are all human, with human needs...