I like this series. The MC isn't retarded but he doesn't progress at an insane rate either. The characters are actually very consistent and it's quite fun to follow the plot. It's a bit outlandish at times with the whole "guide" business but it's fun regardless.
ex-bf guy dumped her and now that she's opened up and changed because of her current bf aka best boi, ex-bf is interested in her again? he can fuck off lmao