Genya aims for the neck of the fifth demon, but the sword breaks due to the unexpected hardness of the neck, and the gun doesn't work either, and he is cornered. He entrusts Tanjiro with the task of confronting the fifth demon, which is believed to be Hantengu's real self, as he cannot cut his neck with his own strength. Receiving Genya's feelings, Tanjiro swings his sword at the fleeing demon. (thetvdb.com)