Zenitsu is battling a pair of demons with Tanjiro for a mission. However, when the demons split up, they are forced to fight 1 on 1. While Tanjiro deals with the other demon pretty well, Zenitsu encounters some difficulties. The demon catches him by surprise using a blood demon art, which shrinks him. The story occurs right after the entertainment district arc in the anime, I will try my best not to give spoilers for anything after season 1 and if I do, I will give spoiler warnings at the beginning of the chapter. I have not read any of the manga, but am planning to, so please don't spoil anything for me. Also a fair warning, my writing is awful. (Cover art is by me btw)