It's actually much better than the images it was originally based on. The first few chapters are kind of eeeeh, but once the relationship gets established, she manages to not be nearly as much of an insufferable bitch as the original source. As in, you can actually see a legit relationship between the guy and girl this time, with her being far less abusive and more of a tease.
It does help that they have some cute interactions from time to time, like chapter 8, and several side chapters with Nagatoro getting actually embarrassed.
Edit: With that said, Senpai's spinelessness does get annoying from time to time. I suspect next chapter will reveal he doesn't know how to swim.