 If you liked
Onnanoko ga Shinu Hanashi
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 ...then you might like
Tokidoki
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Tokidoki and Onnanoko ga Shinu Hanashi tell a story about a young girl dying from a certain incurable illness. The former is pretty straightforward with a twist at the end and also light-hearted in nature. Meanwhile the latter explores more its theme by showing relational impact of the protagonist's fate and illness on people who are close to her. I recommend these two if you like to read manga that handle the related topic in two completely different ways.