Months after arriving at the Heart Kingdom, Asta still doesn't have any magic, but he's become more powerful at an alarming speed due to his training with the Spirit Guardians. Anti-magic is one of the magic attributes that falls into the "Arcane Stage" and is needed to defeat the devil. And because of that, Gaja asks Asta how exactly he obtained the five-leaf grimoire...
The first time I was able to 
willfully take that form was
أوّل مرة تمّكنت فيها من اتّخاذ تلك الهيئة قصدًا
Das erste Mal konnte ich
aus freien Stücken die Gestalt annehmen,
La primera vez que me transformé
por voluntad propia
La primera vez que me transformé
por voluntad propia
Ma première transformation
volontaire,
La prima volta che ho assunto 
quella forma volontariamente
A primeira vez que fui capaz de
assumir essa forma voluntariamente
А по своей воле мне это впервые удалось,