This story is told kind of backwards. Volume one takes place after the characters have already bean in a relationship for around 3-4 years. Volume two tells how they came together.
I felt that Ryouichi Sumi did not develop at all as a character. I also felt that the plot didn't go anywhere. The plot was set up as 'Akiyoshi is growing up and becoming independent' but at the end of 2 volumes, no such thing happens, and when it begins to happen, it stops.
I was disturbed by the age differences between the two main characters. Ryouichi Sumi must be around 25, and Akihoshi is 12. No mater how much you supposedly love each other, that dose not make having sex with a little kid OK. In my opinion, it would have bean much more romantic if Ryouichi had loved Akihoshi enough to wait (yes, shocking that sometimes, not having sex can be the most romantic choice). Akihoshi acts his age, he is somewhat spoiled and hard to get along with.
All in all, not a whole lot of content, what is there is a bit disturbing, and the characters and plot don't seem to go anywhere. Despite that, I do want to read volume three, since that has bean set up as the time that Akihoshi really gets a chance to be independent (+ grow up), and I want to see what happens.