Unbeknownst to him, Aqua's fraternal twin sister, Ruby Hoshino, may be the reincarnation of Sarina Are likely?ji, considered one of Gorou's clients who was a supporter of Ai. 4 a long time later, Ai is murdered in front of the twins by the same lover who killed Gorou. The lover afterwards commits suicide, but Aqua deduces the murderer could have ha