THE BASIC PRINCIPLES OF OSHI NO KO MANGA

Unbeknownst to him, Aqua's fraternal twin sister, Ruby Hoshino, would be the reincarnation of Sarina Tendōji, considered one of Gorou's people who was a lover of Ai. Four several years later, Ai is murdered in front of the twins by the identical fan who killed Gorou. The lover later commits suicide, but Aqua deduces that the murderer can have had