Unfortunately, somewhere around chapter 15, is when it started going downhill. The pacing suddenly grew REALLY fast. The plot lines and romance were extremely rushed, and the mangaka even threw in time skips, all within like 15 chapters. Its like the mangaka suddenly found out that she had to condense her story into 35 chapters when really, it could have been at least 50 chapters.
The rushing of the plot/romance, along with the abrupt change of pacing weakened the overall quality and strength of the manga. It even hindered the character development that started so strong in the beginning. I like Kouichi, but I think that he was the most underdeveloped out of the four main characters. This was a real let down, because I really liked him.
Also, the plot lines started to get unrealistic and far stretched, venturing into the cliche shoujo zone. The whole thing with Natsumi was totally unnecessary and unrealistic. I'd have preferred the author spend those chapters developing Keito and Koiuchi's relationship or developing Koichi's character more. Its really too bad, because I liked Cat Street a lot.
For the first part (chapters, 1-15~), I rate it 9/10, whereas the overall manga, is a 7/10.
