百年來，上弦之鬼首次被殲滅，在惡鬼間引起騷動。炭治郎前往刀匠村取得新刀。

遇見冷漠的霞柱時透無一郎後，炭治郎發現某個特別的機械人偶能幫助他精進戰鬥實力。

炭治郎和小鐵查看緣壹零式體內的古老武士刀，鋼鐵塚自告奮勇要修理這把鏽跡斑斑的武器。

小鐵哀求無一郎救救鋼鐵塚和鐵穴森。與此同時，炭治郎一夥人大戰半天狗的情緒分身。

蜜璃來到村莊，發現村長面臨生死存亡的緊要關頭。可畏勁敵擋住了無一郎的去路。

炭治郎察覺第五隻鬼潛伏在不遠處，於是催促玄彌出手追殺，自己則和禰豆子聯手對付另外四個敵人。

正當炭治郎痛宰小怪時，某個可惡的敵人突然出現在他身後。玉壺趁鋼鐵塚在鍛造古刃時闖了進來。

無一郎與滑溜溜的玉壺對戰，玉壺終於露出真面目，祭出致命攻擊。炭治郎一行人對上有著五個頭的敵人，陷入膠著苦戰。

Tanjiro, Nezuko, and Genya are struggling through an arduous battle against Zohakuten and his five tree dragons. They are forced to fight defensively against the tree dragons using the four emotion demon's powers, and Tanjiro is swallowed by one of them amidst the fight. Just as Tanjiro is close to meeting his demise, Mitsuri arrives in the nick of time and rescues him. And now, Mitsuri faces off against Zohakuten to rescue the captured Nezuko and Genya...!

Tanjiro continues the fight against Hantengu. Amidst all his injuries and the Superior Four's skill, will he be able to defeat him? As the battle draws to a close, the Demon Slayer Squad must race against time to end the fight before dawn.