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...
can't be defeated! If you slash it, it's only
going to split into that many more demons!
،لا يُمكن هزيمته! وإن قطعتَه
!فسينفصل إلى المزيد من الشّياطين
Du kannst ihn nicht töten!
Er teilt sich immer weiter!
¡No podrás derrotarlos!
¡Se multiplican al cortarlos!
son podrás vencerle!
ça ne les tue pas,
ils se multiplient !
हराया नहीं जा सकता!
non possiamo batterli così!
Não dá para derrotar! Se cortar, ele 
só vai se separar cada vez mais!
Они не умрут!