Gintama° - episode 49 - 15 Mar, 2016

Overall episode #313 Farewell Shinsengumi Arc Part Seven: As the chaos continues, Sasaki and his troops switch course by betraying and killing Yata-Garasu troops. Utsuro of the Yata-Garasu appears to slash the rebellion as Gintoki heads off against him. When Gintoki slashes off Utsuro's mask, he recognize the face of his dead teacher. The rebellion decides to retreat due to their wounds. (Source: Wikipedia)