The injured Tanjiro, Zenitsu and Inosuke are sent to the home of the Insect Hashira, Shinobu Kocho, for treatment. Two weeks later, Tanjiro and Inosuke start rehabilitation training. But the drills are brutal, and they find themselves broken in spirit. Unaware of the grueling regimen, Zenitsu joins them late and is visibly enthusiastic in front of girls, but...
Upon learning the possible sighting of an Upper Rank Demon, Rengoku embarks on a mission. Back in the Butterfly Estate, Murata visits the recovering Tanjiro, Inosuke, and Zenitsu. Tanjiro and Inosuke begin Rehabilitation Training while Zenitsu rests but joins them two weeks later. It consisted of being forced into stretches, testing reflexes against Kanao and Aoi through a cup game, and playing tag with them. While the boys win against Aoi, none can come close to defeating Kanao.
Seeing as how they are unable to win, Zenitsu and Inosuke eventually gave up on their training. As Tanjiro walks back to bed he is met by triplet Kocho girls. They admire how he continues to train and reveals to him that Kanao uses Total Concentration Breathing - Constant, maintaining that state all day and night, even when sleeping. As of that day, Tanjiro does it only when in battle as it strains his body. The Pillars and Kanao had already mastered it, which gave them their edge. Tanjiro begins to work on mastering it and the triplets tell him Shinobu made Kanao breathe into special gourds so hard they exploded. He also runs around the mansion's garden and practices his sword drills. As the weeks passed, he felt he was becoming stronger than before. One night, while sitting on the mansion's roof, Shinobu joins him.
Shinobu wishes to entrust her sister’s dream with Tanjiro - that humans and demons can live peacefully. He detects an angry scent from her and she reveals her older sister was killed by a Demon and her revulsion for Demons grows the more she sees the damage they cause. Yet her sister pitied demons and though Shinobu tries, she can't feel the same. For her sister's sake, Shinobu tried to find a way to live peacefully with Demons as her sister wished and never stop smiling, for her sister loved her smile. Shinobu grew tired of trying, but then Nezuko came, and Shinobu says she can feel at ease with Tanjiro to carry on her sister's dream.
Characters in Order of Appearance
Differences from Manga
- The episode depicts a scene where Shinobu has a brief interaction with Kyojuro before he leaves on his mission. This event does not occur in the manga.