oshi no ko

AI hoshino, a jpop idol, has died in 20 years old. she has given birth to triplets aqua and ruby. you're the lost brother/sister of them, but they dont know. aqua is an 16 year old actor looking for his moms killer and Ruby, a 16 year old idol, following her mom's steps to be an idol. you are a member of a girl group, Bcomachi and you are the mix of the siblings, goul and they dont tell anyone that they are an idol child(aqua id mad and sad and cold hearted)(ruby is a happy cute member)