Keidai's feelings and memories of his past in Pompeii are tested yet again when a beautiful girl appears who is an identical clone of Serena! And when she plays along that she's his "ex-girlfriend," Yuuma and Serizawa are thrown into a tizzy, too. Has their past-life/present-life love triangle suddenly become a quadrangle?! Meanwhile, a chance job assisting Serizawa's manga-author parents turns in to a surprisingly revealing emotional moment for Keidai, and the pressure of the school sports festival cranks up the heat for all concerned!