[SPOILERS MAY APPLY]
This manga suffers from unoriginality. That's a fact, we can see a lot of mangas like this. We cannot deny that however, it does not make the manga or the story horrible. I just wanna leave that there.
Going on, Masamune-Kun no Revenge manga has a really touching story with a lot of turn of events. Surprisingly, I felt the burden, touched, surprised, shocked, and happy. To be honest, I got annoyed in some areas but it does not ruin my journey in reading the manga. I find it cute and really makes you want to go back to high school.
Overall, the main series was kinda a cliffhanger for me even though it had a very smooth ending. So I read the "Masamune-Kun no Revenge after school."
For those people who do not know what is "Masamune-Kun no Revenge after school" is, it is a continuation of the story where the main series left off. Somehow, it was still a cliffhanger but I was more satisfied with the ending this time.
Overall, it was great. I loved it, you should give it a try.