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