Unbeknownst to him, Aqua's fraternal twin sister, Ruby Hoshino, will be the reincarnation of Sarina Tend?ji, certainly one of Gorou's sufferers who was a admirer of Ai. Four several years later on, Ai is murdered in front of the twins by exactly the same enthusiast who killed Gorou. The enthusiast later commits suicide, but Aqua deduces that the mu