Asta and Rill Boismortier vs. Gueldre Poizot is a fight the occurs at the Magic Knight Headquarters.
The captured members of the Eye of the Midnight Sun say that the captain of the Purple Orca, Gueldre Poizot, is the traitor among them. Gueldre says that he would never betray his kingdom, and Charlotte Roselei responds that she had heard rumors about him. Gueldre then accuses the prisoners of false information, but Marx Francois says that the prisoners are under his magic and that his Mémoire Absolue is absolute. Yami Sukehiro tells Gueldre to let Marx look into his mind if he has nothing to him.
Refusing to be interrogated, Gueldre says that he is going to clear his name and turns invisible. Yami says that things are going to get serious, and Charlotte explains how Gueldre's magic works. Gueldre creates several Invisible Soldiers to attack and distract the captains. Gueldre thinks about how he has used his magic to obtain his success and how he will not let it end like this.
Asta suddenly appears and cancels out Gueldre's magic with his Demon-Slayer Sword. Yami explains that Permeation Magic may hide magic power but it does not hide ki. Gueldre tries to attack Asta, but Rill Boismortier then uses his magic to restrain Gueldre, trapping him in Spring of Restriction.
Nozel Silva asks why Rill did that, to which Rill replies that the other captains would have taken down the building. Yami comments about how they could not let Gueldre do as he pleases, but yells at Dorothy Unsworth for being asleep. Nozel says that they could have just used stuff not made of magic to attack him. Charlotte says that Gueldre is pathetic, and William Vangeance says that Gueldre might be under someone's spell. Julius Novachrono comments about how he is glad that everyone is here, because he does not know how to hold back.