It could have been better in several ways:
1). I feel that Hayashi sensei fell way too quickly for Ichijou. I wished their love took a little longer to form, instead of so instantaneously. I am pretty sure the author could have elaborated with more ideas, before they became a pair.
2). What was that between Itsuki sensei, Hayashi sensei, and Ichijou? That love triangle was so lame. There could have been more tension and rivalry. Although, the history between Hayashi and Tsuki was pretty deep, it could have been manipulated to add more oomph to the triangle.
3). What about Yonekura and Ninomiya? They could have been a sub plot to this manga and helped stretch the story out more. Or even better by adding Mitsui as the third triangle to this particular relationship?
Overall, it was a cute story. It is something I would read only once. As you have read above, it was a quick read as the plots were hastened. It really could have been better. By the way, I love Yonekura. He is the maiden type, so I was pretty surprised to see him punch Ninomiya for messing with his best friend, Ichijou. Not only that, but I love his evil and angry expressions. It is so refreshing to see that. Due to all this, I feel like Yonekura would make a devilish seme.