Someone help me out on this one:
I have no idea what demographic this manga was run for and the more I look, the less I understand. MangaUpdates says it's a 
shounen manga, which coincides with listings on Kinokuniya for its tankoubons 
including the label "Ura Shounen Sunday Comics" in its titles. However, it in fact 
used to be labeled as a 
shoujo on MangaUpdates until at least this June, and 
certain Southeast Asia retailers (as well as 
Comikey, who digitally distributes the English version) do likewise*. Furthermore, Bookwalker reports that both the
 main manga and 
omake volume were published under the "Ura Sunday Jyoshibu" imprint, "Jyoshibu" being "girls' club"-- and I doubt that would be the name of an imprint targeted towards young men.
...meanwhile, someone else in this thread mentioned that it was actually a 
seinen manga, having won an award for that editorial category. I couldn't find anything about winning an award (most I've got is 
ANN reporting that it ranked within the top 20 of the Tsugi ni Kuru Manga Awards), but the raws don't regularly use furigana on its kanji (this is usually the fundamental distinction of 
seinen and 
josei manga versus 
shounen and 
shoujo manga, the latter of which normally use furigana on all kanji). I'd be inclined-- based on that alone-- to believe that it's at minimum marketed to older audiences (i.e. it's either 
seinen or 
josei) rather than younger (i.e. 
shounen or 
shoujo).
In the first place, it was initially digitally published in Ura Sunday (if you check MangaUpdates, it separately lists "Ura Sunday" and "MangaONE", but apparently 
MangaOne is just the mobile app version of Ura Sunday). I don't think digital manga sites use demographic categories like physical manga magazines do. At least, Ura Sunday 
doesn't have any such indicator that I saw on the comic's page.
*There's a possibility that these parties are appropriating the language of these demographic categories (shounen /shoujo /seinen /josei) while employing them in a way different from the publisher's intentions-- in contrast to American publishers of manga, who instead affix age ratings.
	
		
	
	
		
		
			Few weeks ago it shocked me to find the delinquent tag here since other sites don't have this kinda tag lol but after thinking bout how harsh and offensive the ml and fml are then i realise yeah they're delinquents after all 😂🤦🏻♀️
		
		
	 
Late, and I know you were one of the first to scanlate this manga (good on you by the way), but the manga starts off with Hayame reminiscing on how she ended up in juvie when she was a teenager.