Demon Slayer: Kimetsu no Yaiba Swordsmith Village Arc (Dub) Episode 10 DUB at gogoanime

Synopsis: As the battle with Zohakuten intensifies, Mitsuri also develops a demon slayer mark on her neck. Just like Mucihiro, the power she gains as a result is tremendous, and she's able to overpower Zohakuten for a while.