I kinda wish it was longer to better explain what happened to her sister. To give them more time for their feelings to develop. Also to explain if the twins are his. Since I feel like they were not his and he just took responsibility since i think they were in a relationship or she was someone he met in an omiai that time. I don't know but there many unanswered questions in this story that needs to be addressed.
I need more. Where is the omake or sequel even? The wedding, mating or even having a child.