A young girl has learned to fly, moving from place to place and meeting interesting things. First she observes a bird and chats with it, after which she communicates with a solemn tree that is rooted in the ground, unable to have the freedom that she has found. But ultimately, the girl will have to return from whence she came...
While their plots aren't that similar, Forever Honey (a chapter of Hitori-tachi) and 100 Days Dream are shoujo manga with the same sort of set-up, and I think they would appeal to the same audience.
20-something Meiko Otani is restless, living day to day with a job she hates and an unemployed boyfriend who'd rather be playing in a band. Like others her age, she struggles to find her place in the world and a purpose in life, so in an attempt to make a fresh start, she makes the decision to quit her job. Together with her friends, Meiko will embark on a journey of self discovery to find what will truly make her happy.
While 100 Days Dream is a quick one shot and Solanin is 2 full volumes, I felt the same feeling after reading both of these - Solanin to a much greater extent. Both are about trying to reach one's full potential and experiencing life, with plenty of bittersweet moments to go around.