 If you liked
Kimi no Sekai ni Koi wa Nai
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 ...then you might like
Watashi no Astilbe
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Want some rare examples of aroace representation? You'll get them in both My Astilbe and Is Love the Answer—which I didn't think I would find any in manga, but hey, what you discover may surprise you... which is also something our main character realizes as she meets new people and learns about why she can't seem to see relationships the way most do. Also a rare example of college-age protagonists in manga (afaik). Wholesome friendships abound, you're welcome.