Mugen no Juunin: Immortal S01E20 - Act Twenty - Unending

Rin and Manji chase after Kagehisa, but Shira attacks them and Rin is taken away. Manji goes to rescue her, and meets not only Shira, but Renzou as well. Manji fights Shira in order to rescue Rin. But astoundingly, what slashes at Manji is Shira's left arm, which should have been lost.