This extra chapter is a good thing to really wrap the entire story. Even tough we can't see the detail of their daily life, but this summary is still good. And good thing they really progressing until they get married.
Ok, I just finished watching the entire anime right after finishing the manga and I can say they did a great job with the adaptation imho. What people are complaining about is the first 3 minutes of the first episode where the animators got too excited with the low angles and proportions, but that's all it is, the anime is highly recommended to watch.