Four boys struck by misfortune are contracted into becoming Puerum Magi by Homura and a mysterious creature named "Sanbey". Throughout the months, they will face the difficulties of being a Puerum Magi as they give out the needed bravery and strength to defeat the Warlocks before their mysterious plans unfold.

Charlotte is a talented fighter who is running for her life from a demonic instructor from her past. She fears that she will lose what she values most until she meets a rich boy and his butler who offer her sanctuary.