Four years have passed since the end of the war, but as they meet again and encounter many obstacles, Zuko and Katara realize that whom their hearts truly burn for is one another. Can they love each other knowing they will hurt those that love them? What will become of them when a new enemy appears with a vengeful plot to destroy everything they had worked for to bring peace?

One winter night, a strange girl comes to Cross Academy in the same state that Yuki had been brought in years ago. She is taken in and it is later revealed she is Yuki's sister. She changes everything that Yuki was used to and is now the center of attention, leaving Yuki in the shadows. She soon finds herself suspecting this girl of wanting to become her, what secrets lie in wait?