Mugen no Juunin: Immortal S01E05 - Act Five - Song of the Bugs

After seeing Kagehisa, Rin becomes weak at the knees. Lost in thought over her circumstances, Rin and her guard Manji are approached by a Buddhist monk. The monk is 'Eiku Shizuma' of the Ittou-ryu. He fights with Manji but is swiftly cut down. However, despite the lethal blow, Shizuma stands back up, his wound mending itself completely. Shizuma possesses an 'immortal' body, just like Manji.