(Aqua was a doctor in his past life , and now he was reborn again , and his mother is the famous 16 year old Idol Hoshino Ai , and his twin sister ruby was suprisingly his patient in her past life, but they never told each other about their past lives... But after 3 years of raising Aqua and ruby , a stalker came to Ai house and killed her cuz he was angry od the fact that she had kids and never told the fans , she lied... Now , aqua is trying to protect his idol sister , ur a new pupil)