I was kinda expecting some sort of variation on that famous Sartre play (you probably know the line), but it went in completely different direction. Cool short suspense / mystery, plus, i've got an impression that Kaoru in disguise is some sort of homage to Toume Kei's raven haired female characters (only in some panels though, so i guess i just chose to believe that, because i really like Toume Kei).
Thanks mangadex, i doubt that without forum i would've ever heard about this manga, or found it on my own.