All the Upper Rank Demons assemble at the Infinity Castle after Upper Six Dem...
Demon Slayer: Kimetsu no Yaiba
Season 4 Episode 10: Love Hashira Mitsuri Kanroji
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.