In her past life, Ruby was a fragile girl who died of anaplastic astrocytoma (brain cancer).Now overwhelmed with joy as Ruby Hoshino , the daughter of her favorite idol, Ai Hoshino , takes her life to the fullest, Ruby has set her sights on becoming an idol singer.Ruby is her exact opposite in that she is outgoing, extroverted, loud, optimistic and communicative compared to her somber brother.Ruby tends to speak her mind without filters,