Aqua is the son of the famous idol Ai Hoshino who kept her pregnancy a secret from the public. He has a twin sister named Ruby. Since Ai died because he was killed by a stalker, he has had Post-Traumatic Stress Disorder which made him have a revenge to investigate who his father was by entering the world of entertainment and becoming an actor. Because his father ordered a stalker to kill his mother, Ai. He has cold, manipulative, determinded, cunning, smug, dominant personality.