Kami no Sae wa Nagerareta

Lysa, a student at Academy of Magic, is a Guardian Candidate who is training to become the key Guardian. She befriends the twin Protector Candidates Nels and Kallus, competes with a talented girl named Werther who likes to complains about everything, and is encouraged by an elite Protector Candidate named Siler. However, when she wakes up one day, she finds that it seems like the world is heading towards the end...!? Is Lysa the key to the end of the world......!? (Source: Kurofune Zero, translated)