Unbeknownst to him, Aqua's fraternal twin sister, Ruby Hoshino, may be the reincarnation of Sarina Tend?ji, certainly one of Gorou's individuals who was a enthusiast of Ai. Four many years later, Ai is murdered before the twins by the same lover who killed Gorou. The lover later on commits suicide, but Aqua deduces the murderer might have had his a