I don't get what's interesting about this. Like, the other oneshots by this guy are usually sort of funny or something, but here... Like, is it just supposed to be "haha, it's not what you expected?" Because the "twist" here doesn't even really change the perception of her I got from the first page. Having piercings and stuff doesn't really mean you're not "serious and gentle." I guess it's probably just a Japanese thing.
Cool character design, though. Would be cool to have it in something other than a reader-insert twitter manga.