The skeleton of the plot was functional. If I had to list the main plot points one by one, it would make sense and... well, make a story. Maybe even an amazing story.
However, the meat of the story is... pretty much non-existent. The mangaka does a decent job in putting together the larger bones of the story, which you could argue works for a 3 chapter manga, but missing the finer details that bring character to the people and plot make the overall story a bit more difficult to follow and absorb as well as a story with more development.
To further explain, some of the story elements that were introduced seemed a bit extraneous; all of the information packed into the story had a lot of potential, but weren't explored to the extent I think it could have been. Shiina-sensei made each large component clearly related and linked to the other ones. However, if there was more time to develop the story, perhaps the relationship between Sakura and Isshiki and their personal character battles would seem even more cohesive.
Lastly, the beginning seems to be the only "gimmick" in the story to draw the person in. At least the mangaka wrote in the importance of that event. I'm not too fond of it, but the rest of the story doesn't have tricks like that, so that's certainly something good to me.
The art wasn't to my taste either, but it's not bad to look at in a more objective sense.
tl;dr? This is a functional story that lacked useful, fine details that would have brought more life and depth to the story, but I enjoyed it, for the most part. A quick read.
Sorry, I blabbed a lot this time. ^^;