HHG Megami no Shuuen

HHG Megami no Shuuen is a retelling of Hyper→Highspeed→Genius, featuring returning protagonist Kyuushirou and heroine Mephisto, but with a new cast of heroines. When Kyuushirou wakes up, he has lost his memories and doesn't even know his own name until his younger sister Hikari tells him. They attend Hazuki Academy, a public school for training geniuses to become the 'saintess'. The word 'saintess' makes his head ache, as if it holds a significant meaning from his past that he can't recall. At school, he meets three girls: Nadeshiko, the most saintly from Yayoi Academy; Fiana, the leader-in-waiting for the saintess's knighthood at Saint April Academy; and Sally, a genius from Kisaragi Magic Academy who is the only person in the world with three 'gifts'. Kyuushirou has a premonition that if any of them becomes the saintess, the world will be destroyed. Moreover, someone is after his life. The mysterious assailant Reigetsu tells him that his existence in this world will cause its collapse. But just then, his hidden 'gift' awakens – 'hyper highspeed', the ability to have infinitely many parallel thoughts. He then discovers a giant library that feels strangely familiar. A girl who looks exactly like Hikari greets him: 'Long time no see, or should it be nice to meet you? I am Mephisto, and I am on your side to destroy this world.' From Hau~ Omochikaeri!