It seems you're talking about Look Back, the film based on Tatsuki Fujimoto's manga. It's a really touching story, with animation that perfectly conveys the characters' emotions.
The comparison with Bakuman is interesting, as both works explore the world of manga, but from very different perspectives: Bakuman is a story of perseverance and success, while Look Back has a more melancholic and reflective tone.
What struck you most about Look Back? The relationship between the characters or the way it approaches art and creativity?
I like both, but I chose not to talk much about the characters' relationship since it would give much about the story.