It has been a long time since I've finished this manga but one thing that bothers me and I'll never forgive is Yamato feeling some type of bullshit for the other girl (forgot her name) when he was still with Mai. Like MOTHERFUCKER you have a beautiful girlfriend and you're here over someone else??!!! I know he never cheated but still he gave the feeling he did. I cried that chapter because I felt betrayed somehow. Overall it was well written and the art is not bad but I can't reread this because of Yamato. Mei deserves way better than that.
I don't remember much but it's not the model girl. SPOILERS!!!!
It was when he was in college and there was some college girl who was dumped by her boyfriend ( I think) and they were getting kinda close for my liking. He went out for dinner/bar with her (I don't remeber exactly) and didn't tell Mei about it, then his heart fluttered and he felt something for this girl and then I lost it. He later told Mei about it and he regretted feeling this way for someone else other than his girlfriend. At that point I decided it's not worth it for me to reread. Like I said I can't remember how exactly it went but this scenes were bad for my heart. The manga is for mature people (i don't speak about the smut). Try and see if you'll like it. It depends on your psychology. Have a good day/night.
Looks interesting