@zenyo there is closure. the one that people don't like. Even I don't like it. That is why I was very depressed with their previous work/story. even here it looks like that guy likes her but gets to be a "I will never tell her until "we both marry someone and gets old and by then we can confess that I like her but now we both have our own path.
the MC here is pathetic to the sense that does nothing. the "selfless" act that it shows is a lie. there is selfishness in there. She hates the fact that she was used. It is here that we can see things more clearly cuz she was summoned TWICE by mistake. She just feel like helping and trying to earn some good points but knowing she is not the real deal, her inferiority complex makes her feel guilty. Yes in the end, we see the real one, and she understands that it is not always a good thing cuz they will have to experience some hardship like in the previous adventure... but there is a part that the author doesn't talk about how mistreated the MC feels and try to find some sort of redemption in thinking the the real princess/the avatar will have a bad time as much as she got and will suffer as much as she did, the fake one, if not worse before she finds a happy ending.
I didn't like how the boy she likes stayed months after coming back, and he just came back to the time she got to return. It shows, he even said it that he got to know she was not his princess, already experienced and interacted with the other girl. they might have some sort of crush with one another but noticed that nothing will happen cuz they both see that it was just the heat of the moment...but he will say nothing to the MC and let things continue as they usually are. in the end, the MC has and will have a tragic ending. She will marry without love and the guy will fall in love but will remember the MC and like I said in the beginning, they might meet again when they are old but will be too late. the MC wasted her time.
the author is making the MC has a bad and a sad life cuz she will forever remember she is a "fake one" and will never be good cuz there will be someone who fits the role better than her, workplace, school in the family, friendship, etc. The only way to change things is for the MC to actually 1) have to face her fears and become the heroine in her own world. But as things are I don't think so. They will need someone to push her and no one will at least someone or she meets a group that is like a cult or a supernatural thing in her world or 2) be summoned , for the third time, to another world and this time learn to become the role she is supposed since she is the real and the correct heroine to be cuz as things are going, she will always be "selfless" but like I said.....just cuz you do nothing, doesn't mean you are being generous or are being good. It can actually cause the oppose effect.