If you liked
Kono Naka ni Hitori, Imouto ga Iru!
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...then you might like
Nisekoi
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In a harem comedy anime, one major problem writers have to overcome is how to maintain the "harem" situation, since in normal circumstances any such arrangement would quickly collapse. Most harem comedies do this by making the protagonist or the girls (or both) defective in some way (stupid, socially inept, etc.). One of the reasons I like Nisekoi is that (while some of this is still present), there are more complex plot devices at work which which sustain the harem (the question of the childhood promise and the need to fake a relationship to avoid a turf war). Kono Naka does this even better; the protagonist is even more sane but is dealing with the twin pressures of having to marry before graduating highschool and knowing that his biological sister (whose identity he doesn't know) is a student at the school and actively trying to seduce him. The circumstances and decisions of the protagonist are things a reasonable person might do, and this makes for a much more interesting story than "the protagonist is too emotionally immature to choose a single girl".