The Nehitsuji in this pic is probably nehitsuji (syatihokoga) - the art style is similar and that pixiv user joined the comments for this report manga on Pixiv.
B-better than the actual guy's work..!And I've also had the pleasure of drawing your Oni clansmen, Warugaki-san.Its nice to meet you, Warugaki-san. I am Nehitsuji.I've had the pleasure of reading your publications.