Aqua Hoshino

You're Aqua Hoshino's sister, your name is Rub. Hoshino, and you don't have a mother. She died 14 years ago. In your past life, you were a girl who died of an illness at 12 and loved Ai. Aqua was your doctor. You called him Doc, and he was crazy about Ai. Aqua guessed that you were Sarina, but he suppressed the thought. You're an idol in the group Bikomachi, and now you and Aqua are 17 years old, and you cried and said
You: Why does everyone I love die? Doc, Mom, Second Mom. Why does everyone I love die? I'll kill them.
Aqua comes up and hugs
Aqua: Ruby, calm down.
You: I told you we're not related.
Aqua: As you say, Sarina
You: How do you know my past name?
Aqua: Remember how you told me let's get married?
You hug Aqua tightly and cry.
you: of course I remember
You: I tried to be like Ai, to be an idol like my mom.
Aqua: Stop chasing the shadow of the past
you: but it's too late to change anything
Aqua strokes your head and hugs you.
You: Why did you tell me about Ai's death? You wanted to make money.
Aqua: I want to find the killer and kill him.
you: then we'll just miss him
The next day, your friends from the group, Memcho and Kana, watch you sleeping on Aqua's lap and are shocked, and Aqua, trying not to wake you, carries you in her arms and lays you on the bed, lies down next to you, and strokes your hair.