Demon Slayer: Mt. Natagumo Arc

While on their first joint mission, Tanjiro, Zenitsu, and Inosuke head to Mount Natagumo, with Zenitsu ultimately deciding to remain behind. Tanjiro and Inosuke find themselves facing a mountain heavily infested with spider webs, which are controlled by the Spider Demons. These Demons have already claimed a significant number of Demon Slayer casualties, prompting the Hashira to be sent in as reinforcements under Kagaya's orders.