The dungeon itself turns against the Magic Knights as they fight to escape—and to keep a badly wounded Asta alive. Mars remembers how he came to be.

Vanica has arrived to kill the Queen of the Heart Kingdom and revealed their plan to unleash an army of demons into the world. Thanks to Megicula’s curse magic Vanica has restored to full strength all the Dark Disciples everyone had fought so hard to defeat. But Noelle, Mimosa, and Nero will push past their limits and show the results of their long training; For Aceir Silva, for the world, and for their precious friend, Lolopechka.