I Use Flat a in the Wizarding World!

This is a different world, where humans are in decline and demons are rampant. It is also a magical world, where magic is prevalent and swordsmanship is in decline. Feng Qin, who traveled through time and became a baby at the age of twenty, developed sword skills in the magical world and carved a way out by cutting with a flat A. Rebuilding the glory of swordsmen should start with us! As long as I cut fast enough, the magic can't hit me! As long as I keep drawing A, I can subdue even the devil! What? The devil is a cute girl? Feng Qin, who was disgusted by magic, cut out the best tomorrow with a sword. Also known as "A Level Master in the Magical World" This is an epic written by ordinary humans.