This is a short 4-page full-colour omake of the Brocken Blood V manga that appeared in Change H! Blue. The mangaka is Shiono Etorouji who also created the Bloomed in Action manga being published in the Change H! anthologies.
There wasn't a lot of text to translate but cleaning it and rebuilding the backgrounds was a pain and I gave up after a while and bodged it. Sorry about that.