Asta and the others safely return to the Black Bulls' base after defeating the Eye of the Midnight Sun and the Diamond Kingdom in the Witches' Forest. Now that Asta's arms have healed, the Black Bulls as well as Yuno, Klaus, and Mimosa are relieved. However, there's no telling when the Eye of the Midnight Sun or the Diamond Kingdom will try to attack the Clover Kingdom again. Klaus then brings up a proposal to Yuno and Mimosa.
have the Demon-Slayer Sword 
and the Demon-Dweller Sword?
السيف قاتل الشيطان والسيف مستوطن الشيطان؟
das Dämonenspalterschwert
und das Dämonenaufnehmerschwert?
la Spada fendi-demoni e la Spada alberga-demoni?
tem a Espada Matadora de Dragões
e a Espada Lar do Demônio?
Разрубающий демонов!
И Воплощающий демонов?!