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...
In order to forge you
a stronger sword...
...غايته هي أن يطرّق سيفًا أقوى لك
Damit er dir ein noch stärkeres Schwert
schmieden kann, das dir das Leben rettet.
Quería forjarte una katana
más fuerte para que no murieras.
Pour fabriquer un meilleur sabre
qui te garderait en vie.
तुम्हारे लिए एक शक्तिशाली तलवार
बनाने के लिए ताकि तुम मारे न जाओ।
L'ha fatto per riuscire a forgiare 
 una katana tanto forte che ti impedisca di morire.
Para que você não morra,