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.

Because of Noelle's hard work, the Black Bulls are able to get through the harsh mana currents and safely arrive at the Underwater Temple. Everyone is nervous, since they've never been here before, but the underwater people welcome them with open arms.