These are the rules for you and me to be a family. We're family, so you can't like me...okay? There is a girl in my class who is extremely beautiful and has beautiful hair. She has an indescribable aura that sets her apart from the rest and makes her really stand out. However, she has a secret that no one knows about. That secret is, that she has a hidden side. I found out her secret by accident, and since that day, Tachikawa has repeatedly told me not to tell anyone about that day. One day, the day my dad and I was supposed to have dinner with my dad's new partner, I had never expected my stepsister-to-be was----- As our relationship changed from classmates to family, she said to me, "Don't fall in love with me, okay?"