Girl Band: Why Did You Treat Me as a Food Substitute?

[Mygo+mujica+other Laobang groups][1V1] I was born in the Toyokawa family and I am the twin sister of Toyokawa Shoko. I am actually frail and sickly. Fortunately, I have an older sister who has been taking care of me. "Ruiyu, I formed a band!" "Today... I made another new discovery. I'm really looking forward to what will happen to the band tomorrow!" My sister has formed a band. Although I am a little envious, I also like to be happy when my sister is so happy. "Ruiyu..., You have to take care of yourself from now on..." "Sister? What's wrong? You suddenly said this..." My sister suddenly left my life and left with my father, but the strange thing is that my grandpa told me that the family inheritance rights will be given to me in the future, but what I think of is my sister...