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If you're looking for manga similar to Kiss x Sis, you might like these titles. All recommendations are made by Anime-Planet users like you!
Yoru Made Matenai is like a twinless and less explicit shoujo cousin of Kiss x Sis. Rather than writing the "if you liked one" formula, I can say that it is very unlikely that you are going to like one of those if you didn't like the other.