I hate that they had to do another time skip, and I especially hate that it took jealousy to bring them together. I honestly thought that Akira seeing Fumi with other girls would have made her realize her feelings earlier in the series, but I guess not.
Also, the part about the relationship going from fun to too serious.. I felt the writing didn't portray that well enough. They were still having a good time at the movies one chapter, and then the next they were acting kind of awkward and trying to mess around before Akira broke it off without talking it out (at least on the page).