After having her strongest puppet defeated by Tanjiro and Inosuke, the Mother Spider Demon has been decapitated by Tanjiro. She expresses the unexpected feeling of warmth and gentleness similar to a "spring rain" and her inability to feel any pain despite her dying.
The scene flashes back to an encounter that she had, the Mother Demon is on the floor withering in pain at the feet of another demon. She's bleeding from her eye and is apologizing for angering him, and pleads to know of what she did to upset him. Rui is seen hovering above the pair, and bluntly states that her offense was "not knowing why he's angry." 
Watching from behind a tree is another younger male demon, who reveals that the one attacking the Mother demon is known as the "Father" demon. In a nearby tree,there is a second female demon who watches the Father demon once again attack the Mother demon with a concerned look on her face, but she does not intervene.
As the flashback ends and the Mother demon experiences her final moments, she witnesses Tanjiro's "kind, practically transparent eyes" and is reminded of the person who used to love her when she was a human. Before disintegrating entirely, she warns Tanjiro that one of the Twelve Demon Moons is present in the forest and that he must beware.
Tanjiro remains shocked and questions her final words. He realizes that the Demon Moons contain high concentrations of Muzan Kibutsuji's blood, and that he would need to collect it in order to create a cure for Nezuko. Tanjiro snaps back to reality and returns to check on Inosuke, he informs him that he had defeated the Mother Spider Demon and asks if he is alright. Despite Inosuke's proclamation of his strength, Tanjiro notices the gory wounds and feels guilty for failing to protect Inosuke as well as the swordsmen who were killed.
Characters in Order of Appearance
- Mother Spider Demon
- Tanjiro Kamado
- Father Spider Demon
- Older Brother Spider Demon
- Older Sister Spider Demon
- Inosuke Hashibira
- Zenitsu Agatsuma
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