The Wizard King summons Asta after his work dealing with the Eye of the Midnight Sun. Yami tells Asta he can come with him to the royal capital, since he has to go to a conference of all the Magic Knights Captains.

Entrusted with a mission by the Wizard King, Asta and the other Black Bulls head to Raquey, a place that's surrounded by strong mana. With Captain Yami gone off somewhere, the other members decide to play around on the beach in their swimsuits.