The battle between Tanjiro Kamado and Inosuke Hashibira and the Spider Demon (Mother) took place on Natagumo Mountain. It follows demon slayers Tanjiro Kamado and Inosuke Hashibira as they fight the spider demon Mother.
As Tanjiro Kamado and Inosuke Hashibira stroll around Natagumo Mountain, Inosuke notices cobwebs all over his hands. When the two Demon Slayers look around, they notice cobwebs and white spiders everywhere. To Inosuke’s chagrin, Tanjiro tells him that it was because of him that he was able to enter Natagumo Mountain; he thanks him and is much encouraged to fulfil the goal.
Seeing the Mother Spider admit defeat, Tanjiro shifts his hold on his Nichirin Blade and decapitates the Demon with the Fifth Form of Water Breathing: Blessed Rain after Drought.