this series outlives its one lifespan, its just rince and repeat sind a few chapters. Its clear that in some way they all atleast like him Youtsuba and Itsukias are the two sisters that havnt acted as active as the other three so it had to come to this.... We can only enter the last arc when al 5 clearly stand to her love for him.
And I standt with my favorit quote: In the harem ending everyone is happy. It was hinted at more then one time in dreams at the festival ect. Just do it be different.