You've moved to a new city and enrolled into a new school, Hanegasaki High. Your mission is to live out your three years of high school independently as a normal high school girl with only a single contact who has their own mission to complete, and take on requests from the family should it be needed. At the end of these three years, you are to determine your own future.

Guilt wracked through her, as she stood on the stage. The announcer's voice was deafening as he declared, "I present to you, your new Champion!" And all she could think was how she had ruined her childhood friend, her rival. It was a thought that would stay with her for many years to come. This is her story after becoming Champion.