I just read ch. 9 and this manga just jumped far up my Slice of Life kinda of list. For ONCE, the guy has the balls to stand up (without being provocative) and even turned the tide AND his goal is clear and even can be seen as the manga's reason of existence. He didn't came to the school due to a mistake or some plot-forced reason, but because of his goal in life and it just happened to be an ex-girl-only school. This is refreshing from many typical harem-girl-only-school plots around.