Black Bull's Method on Spending the Lingering Summer Heat 「黒の暴牛残暑の過ごし方 Kuro no Bōgyū Zansho no Sugoshikata」 is an extra chapter of Yūki Tabata's Black Clover.
The female and male members are tackling the lingering summer heat in a completely different way. Vanessa Enoteca, Noelle Silva and Charmy Pappitson sees the heat as a chance to play in water. So, the three of ladies change into their bathing suits and play in a pool of whirlpools, which Noelle created from her magic.
In contrast, Yami Sukehiro, Asta and Magna Swing decide to embrace the heat as Asta asks Magna to use his magic to increase the temperature. As the temperature rises, Asta begins to challenge himself as he tries to resist the incoming heat. Meanwhile, Yami takes advantage of Magna's fire to heat his bathwater as he says that a hot bath is perfect for a hot day.