Nana, Orange Recommendations
Both feature a melancholic atmosphere and female leads that learn about themselves and try to change, to better themselves while recognizing their own limitations.
The atmosphere of both manga have a melancholy feel of times past, the dreamy art is also similar. Both manga are written in a reflective way that center around themes of love and relationships we hold and value with people. Both manga are also excellent and my favorite manga in the Shojo genre.
The back and forth between the past and the future scenes really remind me of Nana. It feels really similar except that Orange is in a school setting.