Tenshi, Ei-chan, and Shiratori all attend Kawagoe Academy. One day, they get pulled into the orbit of former conductor Haruo. He drags them into his newly founded boys choir where they suddenly find themselves performing a song in front of an audience!

One day during training, Blade is suddenly attacked by Sophie. This Sophie, however, turns out to be one of five identical clone assassins, who will do anything it takes to murder the Great Hero and prove their superiority!

One day during training, Blade is suddenly attacked by Sophie. This Sophie, however, turns out to be one of five identical clone assassins, who will do anything it takes to murder the Great Hero and prove their superiority!

The Duke and all his friends head off to the wizardry school, and Daleth follows as well.

Muichiro rescues Kotetsu who was being attacked by a goldfish demon. He tries to rush to the village where crisis is looming, however is asked by Kotetsu to rescue Haganezuka and Kanamori, so he begins heading their way instead. Meanwhile, Tanjiro, Nezuko and Genya are facing off against the demons who have split into four separate bodies. Separated from the rest, Tanjiro alone continues to fight a close battle with the demon with a mark of the word "Joy"...

Muichiro rescues Kotetsu who was being attacked by a goldfish demon. He tries to rush to the village where crisis is looming, however is asked by Kotetsu to rescue Haganezuka and Kanamori, so he begins heading their way instead. Meanwhile, Tanjiro, Nezuko and Genya are facing off against the demons who have split into four separate bodies. Separated from the rest, Tanjiro alone continues to fight a close battle with the demon with a mark of the word "Joy"...

Yoriichi Type Zero is destroyed at the end of Tanjiro's training, but a sword from over 300 years ago appears from inside. Kotetsu gives Tanjiro the sword, however it is badly rusted. At that moment, Haganezuka appears and takes the sword with him to perform a grueling whetting process handed down within his family line. Meanwhile the presence of demons are inching closer to the village...

Tanjiro encounters Mist Hashira Muichiro Tokito and Kotetsu, a boy from the village, arguing. Muichiro is demanding that a "certain key" be handed over to him from Kotetsu. Being unable to look on in silence, Tanjiro intervenes to speak on behalf of Kotetsu, however Muichiro refuses to listen. According to Kotetsu, the key is used to operate a battle-type Mechanical Doll, Yoriichi Type Zero, that mimics the movement of a certain real-life swordsman...

An Upper Rank Demon has been defeated for the first time in a hundred years by Uzui, Tanjiro and his comrades' effort. This news causes a ripple effect not only among the members of the Demon Slayer Corps, but also the Upper Rank Demons, who have been summoned by Muzan Kibutsuji. Meanwhile, Tanjiro is recovering at the Butterfly Mansion when he discovers that he has upset his swordsmith Haganezuka after chipping his sword and decides to head to the village where the swordsmiths live to talk to him in person.

Yoriichi Type Zero is destroyed at the end of Tanjiro's training, but a sword from over 300 years ago appears from inside. Kotetsu gives Tanjiro the sword, however it is badly rusted. At that moment, Haganezuka appears and takes the sword with him to perform a grueling whetting process handed down within his family line. Meanwhile the presence of demons are inching closer to the village...

Tanjiro encounters Mist Hashira Muichiro Tokito and Kotetsu, a boy from the village, arguing. Muichiro is demanding that a "certain key" be handed over to him from Kotetsu. Being unable to look on in silence, Tanjiro intervenes to speak on behalf of Kotetsu, however Muichiro refuses to listen. According to Kotetsu, the key is used to operate a battle-type Mechanical Doll, Yoriichi Type Zero, that mimics the movement of a certain real-life swordsman...

An Upper Rank Demon has been defeated for the first time in a hundred years by Uzui, Tanjiro and his comrades' effort. This news causes a ripple effect not only among the members of the Demon Slayer Corps, but also the Upper Rank Demons, who have been summoned by Muzan Kibutsuji. Meanwhile, Tanjiro is recovering at the Butterfly Mansion when he discovers that he has upset his swordsmith Haganezuka after chipping his sword and decides to head to the village where the swordsmiths live to talk to him in person.