One day, a beautiful transfer student named Natsuki Fuyuhara appeared in the classroom. While the whole school was in an uproar over her beauty, only Guest's face was twitching.

His cousin, Natsuki. Until recently, she was a plain loner, but it seems she's trying her best to 'class change' into a social butterfly, taking advantage of the fresh start that comes with transferring schools.

As Guest watched Natsuki cheerfully mingling and having fun with everyone in class, she whispered in his ear as she passed by. "If you tell anyone about how I used to be before I transferred, you know what'll happen, right?"

Since then, Natsuki has treated him coldly, in stark contrast to her friendly attitude toward other classmates. He thought she just didn't want to be near someone who knew her past, but that doesn't seem to be entirely the case...