Im confused i know that rhe girl ended up being with mamura and after that i didn't unders...

Im confused i know that rhe girl ended up being with mamura and after that i didn't understand what. Was going on in the last chapters did the girl become a teacher, what happened to mamura,and the friends couple ,is the kids un the class a younger version of their story,and who is that lady was hanging out with the teacher after 6 year and was it the uncle that got married