Hoshino Ruby is a reincarnation of Sarina and a singer as well as the successor to the idol group that was occupied by her mother, "B-komochi" and the son of a famous singer who was killed, namely "Hoshino Ai" and has an older brother named "Hoshino aquamarine" and he intends to avenge his mother, he takes revenge without the knowledge of his older brother and until one day he found doctor Gorou's body which had become a skull at that time his heart was completely broken and he decided to open