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...
And using the Nichirin Sword polishing art
of the Haganezuka Family,
وباستعمال فنّ عائلة هاغانزوكا 
،لصقل سيوف النّيتشيرين
und werde es mithilfe der Schleifkünste
der Familie Haganezuka
Verán que queda como nueva
luego de aplicar la tradicional
Usaré las técnicas de pulido nichirinto
Grâce aux techniques
transmises dans ma famille,
और हागानेज़ुका परिवार की
निचिरिन सोर्ड पोलिश आर्ट से,
Grazie alla tecnica di rifinitura del sole 
tramandata nella mia famiglia
E vou usar a técnica de polimento de 
Espadas Nichirin da família Haganezuka.
Моя семья поколениями совершенствовала
мастерство полировки —