In contrast to this, in Kono Naka has comparatively sane and level characters on both sides. Instead, they build the tension through the mechanism hinted at in the story's title: one of the girls in the harem is secretly the protagonist's sister (and he knows it). Since the protagonist has to get married before graduation he's under immense pressure to find a girl he likes (and there are plenty interested in him). Over the course of the series, these two forces push him back and forth between playboy and gynophobe.
It's refreshing because the actions of all the characters are (more or less) relatable; there are no insane characters or total idiots -- you can imagine these events actually taking place.
It's not perfect of course. The anime is composed of three arcs. The first arc is by far the best (4 episodes). The second arc is quite weak (it could be cut without losing anything important). The third and final arc is ok; it picks up where the first arc ended but it's pretty predictable (my guess of the outcome made during episode 1 was validated in episode 12).
To summarize: It's a show with a neat premise and OK execution. It could be better in the middle and the ending is predictable, but if you like harem comedies this is one to watch.
