Whilst walking to the Common Room, Byleth gets a shrinking feeling. With each step she takes, she shrinks smaller and smaller. The tiny Byleth soon finds herself stranded in a huge corridor, yet that isn't the strangest thing to happen to her. While standing atop a tome, awaiting rescue, a man that bears a close resemblance to her appears! Not knowing what else to do, Byleth decides to seek the aid of this mysterious stranger...