Asta and Kiato vs. Vetto

Asta and Kiato vs. Vetto is a fight that occurs in the maze within the Seabed Temple.

Pre-fight
Vetto goes to finish off Magna Swing and Luck Voltia, but Asta blocks the blow with the Demon-Slayer Sword. Vetto is glad to see Asta and tells him that he will pay Asta back manifold for the harm that Asta inflicted onto Licht. Asta replies that his seniors are not insects, and that he will now take up the role of defeating Vetto.

Fight
Asta draws the Demon-Dweller Sword and slashes Vetto across the chest. Vetto compliments Asta's Anti Magic attack and rates it above Magna and Luck's Flame-Lightning Explosive Cannon. Asta asks what they are planning to do with the magic stones, but Vetto refuses to tell Asta anything. Vetto tells them to come because he will crush them like the others. Kiato notices his father and thinks about how much power Vetto has. Vetto threatens to attack everyone in the Seabed Temple until he gets the stone, but Kiato says that he will not let Vetto do that.

Asta and Kiato charge Vetto, who easily blocks, evades, and counters their attacks. Kiato and Asta are pushed back, and Asta thinks about how Vetto is reading their movements. Asta comments about how Kiato was holding back in their fight, and Kiato says that Asta was doing the same too. Vetto comments about how weak the two are, and they say that they are going to get serious and charge at Vetto. Asta and Kiato continue their assault and are thinking that they can win when they land shallow blows. However, Vetto easily knocks both of them back into a wall.

Vetto tells them that those kinds of attacks would not affect him, but Asta stands back up and tells Vetto that he is not down yet. Vetto continues his attacks against Asta and explains all of Asta's weaknesses. Vetto throws a boulder to demonstrate Asta's inability to counter long-range non-magic attacks. While Asta is distracted, Vetto dashes forward and barrages Asta with punches, demonstrating Asta's weakness against Reinforcement Magic. Despite his injuries, Asta refuses to give up, which Vetto points out as his third weakness and strikes the boy's right elbow.

Vetto grabs Asta's left wrist and lifts him up, while Asta drops the Demon-Slayer Sword due to his right arm's injury. Vetto tells Asta that a miracle is not going to happen just because Asta continues to battle him. He also says that Asta does not deserve to have those two swords and starts to crush Asta's arm, wanting to hear Asta scream in despair. Asta bites Vetto's arm and says something, which Vetto does not understand.

Post-fight
Kahono hits Vetto's arm with her Song Magic, forcing him to let Asta go. Noelle Silva and Kahono then tell Vetto what Asta said.