THE ULTIMATE GUIDE TO OSHI NO KO MANGA

Unbeknownst to him, Aqua's fraternal twin sister, Ruby Hoshino, will be the reincarnation of Sarina Tendōji, one of Gorou's people who was a lover of Ai. 4 yrs later on, Ai is murdered in front of the twins by a similar supporter who killed Gorou. The supporter later on commits suicide, but Aqua deduces that the murderer can have experienced his a