The "campus sword & sorcery" story is set in a private high school that brings together "saviors," youths with awakened memories from past lives. Some of them are Shirogane who fight enemies with weapons and techniques gleaned from the Prana powers from their own bodies. Others are Kuroma who wipe out enemies, with magic to manipulate the Mana powers that surpass physics. A boy named Moroha Haimura enrolls in this school. He is the first person in history with past lives of both Shirogane and Kuroma.

Takagami Riu graduated from middle school. All of his dreams as a normal student had vanished - he was assigned to become a student soldier "Gakuhei" and filled his life with trainings. After the hard training session, Riu was called by instructor and appointed as a "BodyGuard", demanded from a magician officer. "Why it has to be me?" Riu asked this question to himself, and what awaits for him was a cute girl that dressed weird.