The strange little black bird Nero, who kept following Asta around, suddenly appears before Finral, who had just finished fighting with his brother Langris, and demands that he take them to the Demon’s bones back in Hage Village. Finral is obviously startled that Nero’s suddenly speaking human words but obliges and takes Nero to the bones and witnesses an unbelievable sight. We will finally find out the true events that befell the elves 500 years ago! Meanwhile, back at the Shadow Palace, the devil’s eerie magic fills the room.

Licht and Lumiere fight against the devil using incredibly powerful magic. But the devil has incredible regeneration powers and quickly heals himself, making him difficult to defeat. Asta witnesses the two powerful mages fighting and tries to figure out if he can use his anti-magic in a more useful way. He’s able to use a new power, but it’s so powerful that he’s having a hard time controlling it. Meanwhile, Yuno also awakens to a new power… Asta and Yuno, who both aspire to be the future Wizard King, pull off an impressive attack in front of the first Wizard King!

Asta and Noelle are captured along with Nero and they head toward the strong magic region near the border when Captain Yami and Magna arrive. Captain Fuegoleon and Captain Nozel also show up, causing the Devil Believers to panic. The captains try to talk to the Devil Believers, but their distrust for them is just too strong. The Devil Believers try to bring their powers together in order to face the Magic Knight captains.

To prepare for the upcoming battle against the devil, the Black Bull Grey decided that she needed to get over her shyness and be able to face her friends first before anything else, so she asked Noelle to mentor her. However, things aren’t going very well. Next, Grey tries to get Gauche to help her, since they had fought together in the past. For this training, she walked around town with him when it was crowded, but then they saw a panicked Charlotte run by.

The Magic Knight Squad Captains gather for a meeting and for an award ceremony with the king later. At the meeting, they decide that Asta, Nero, Noelle, Luck, Finral, Mimosa, Leopold, Charlotte and Rill will be going to the Heart Kingdom to train with the Spirit Guardians. At the award ceremony, Yuno advances very quickly in rank.

Though Vangeance, the Captain of the Golden Dawn, had asked Langris to return to his duties as vice captain, he continues to distance himself from the squad. Yuno had suddenly moved up all the ranks at a decoration ceremony and Langris asks him to fight him. The rest of the squad seems shocked, but Yuno accepts Langris’ request and fights him and they have a fierce battle. But during their fight, Yuno seems to have some doubts with how Langris is fighting.

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.

As the battles in the Heart Kingdom begin to come to an end, Asta and Yami decide to work together as they continue in their fight against Dante Zogratis of the Dark Triad.