Infiltration
Noelle and Finral go to visit Asta's sword instructor, Fanzell, in hopes that he'd know a way to fix Asta's arms. Fanzell's fiancee, Domina, tells them that the Queen of Witches in the Witches' Forest should be able to dispel ancient curses, so they go to visit her. They eventually get Asta as well as Mariella to tag along and Domina leads them to the forest. However an incident occurs and their infiltration soon gets found out. They manage to bust into the Queen of Witches's mansion, but she already had a prior guest. It was Vanessa, who also came from the Witches' Forest just like Domina...
Aired 06/11/2018EP 57 - Infiltration
Black Clover
In a world where magic is everything, Asta and Yuno are both found abandoned at a church on the same day. While Yuno is gifted with exceptional magical powers, Asta is the only one in this world without any. At the age of fifteen, both receive grimoires, magic books that amplify their holder’s magic. Asta’s is a rare Grimoire of Anti-Magic that negates and repels his opponent’s spells. Being opposite but good rivals, Yuno and Asta are ready for the hardest of challenges to achieve their common dream: to be the Wizard King. Giving up is never an option!
(Source: Crunchyroll)