Unbeknownst to him, Aqua's fraternal twin sister, Ruby Hoshino, may be the reincarnation of Sarina Tend?ji, one of Gorou's patients who was a enthusiast of Ai. Four a long time afterwards, Ai is murdered before the twins by exactly the same supporter who killed Gorou. The supporter later on commits suicide, but Aqua deduces the murderer could possi