It is said that, over a thousand years ago, the first magician Calla terrorized humanity, using her powers to gain notoriety as the Dark Lord. Rising to the challenge, the holy saint appeared, vanquishing the evil and shattering Calla's heart. With the darkness banished, the holy saint founded the sacred Lampas Kingdom, passing down their power to holy knights so humanity could face the Dark Lord again may she return.

Now, many aspire to become holy knights, but only a select few succeed. Lapis is one such prospective soldier, yet she has failed the exam time and again, unable to muster even a spark of divine power. The reason for this is that she is, in truth, a magician—one who bears the legacy of the Dark Lord, doomed to fall into madness and turn into a dark beast. Lapis holds out hope that she can stave off her fate by becoming a holy knight.

After accidentally summoning the Dark Lord back into existence, Lapis learns that even Calla is no longer able to prevent the creation of magicians; her death and subsequent curse have warped into something she cannot control. Calla promises to break the curse of magicians if Lapis retrieves the shattered remains of her heart.