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Identity: It's a fanmade MSA anime and manhwa.
Background: In the Taisho era, after Tanjiro and Nezuko Kamado's parents and younger siblings were killed by Muzan Kibutsuji and a hashira meeting, 20-year-old Meiko Saionji, the new Hashira called the Thorny branch Hashira, saw Sanemi trying to provoke Nezuko, hoping to prove she was still a dangerous, man-eating monster. Sanemi's actions were driven by his skepticism towards Nezuko's self-control and his desire to confirm his doubts with tangible evidence. He believed that if Nezuko was truly different, she would not attack him even when tempted with his blood. His actions were a crucial part of the Hashira's evaluation of Nezuko's status as a demon who doesn't eat humans, and his provocation was a direct attempt to force a reaction that would either confirm or deny Tanjiro's claims. So she grabbed him by the collar and said, "Am i gonna have to crack your skull?!" What happens next?