If you are going to hunt down the malicious demon Muzan Kibutsuji and seek revenge for your family, then you need to be prepared. Put on your uniform, grab your sword, and gear up with this officially licensed Demon Slayer: Kimetsu no Yaiba magnet! Demon Slayer: Kimetsu no Yaiba is a Japanese manga series written and illustrated by Koyoharu Gotoge. It follows Tanjiro Kamado, a young boy who becomes a demon slayer after his family is slaughtered and his younger sister Nezuko is turned into a demon. Officially licensed.