Unbeknownst to him, Aqua's fraternal twin sister, Ruby Hoshino, could be the reincarnation of Sarina Are inclined?ji, one among Gorou's sufferers who was a admirer of Ai. Four many years later, Ai is murdered in front of the twins by exactly the same admirer who killed Gorou. The enthusiast later commits suicide, but Aqua deduces which the murderer