That was good but in all honesty the "last arc" was mostly about Yuu-chan saying "Keita I love you" in different ways. Too sweet for me and a bit boring too. But it has a satisfying ending. Final rating 7/10.
Thank you for translating this manga!
It is great to have a happy ending filled with cuteness and the utter defeat of the insecurities that plagued this poor girl with the tsuntsun virus!