To be honest I don't want to hate or anything but I didn't like the ending because there was no character development between Natsuo and Hina ever since the beginning of the manga. In the beginning, Hina was being selfish and ended things with Natsuo even though she didn't want to hurt him. The only reason why people liked Rui more than Hina is that we saw more of Natsuo with Rui than Hina. Another thing is why did it skip 5 years because we had no idea what caused natsuo to like Hina even more even though he was in love with rui