The Targeted Heart Ruby

Momoka is searching for her new friend Shiori's necklace, Shiori didn't search because it would take a lifetime to search for it. However, it was all a lie because Shiori is secretly aiming for Momoka's heart ruby. Rin is concerned about Momoka searching for it but due to excessive worrying she breaks out with a flu the next day. When Rin visits the hospital she meets nurse Naoko Shirai who has been turned into an Akiramest. Can Pure Rise by herself!?