 If you liked
Kingyosou
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 ...then you might like
Shuukatsu!! - Kimi ni Naitei
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Both Shuukatsu!! and Kingyou Sou has an amazing sense of reality to it, so much so that you can relate to in even when you never actually experience any of those scenarios. The heroines in both mangas are innocent in different ways, and grow up gradually while they falling in love with a guy. The pace of the story is roughly similar too. Although one's josei and the other is a shoujo, you'll definitely love one if you enjoyed the other.