It's by far the laziest of all ends that attempts to please everyone and ends up pleasing nobody. HinaXnat shippers were given the pity win, Rui and Natsuo just "gave up" on their feelings for each other and devoted themselves to taking care of Hina and when she woke up, Rui walk's off into the sunset with Natsuo's kid as the consolation prize. It strains credulity and it insults the readership, but this is what happens when an author listens to the screeching on twatter and considers it "valid feedback".
@CykaClap this is the greatest mystery of all. Either A) she actually intended to have Rui win but was brow-beaten into this end by Hina-tics or B) she expected to end the manga much much sooner but the editors were like, "holy shit, people are lovin' this, keep writing so we have something to publish" and she did... she just let the story and characters take on their own life until Kei realized, "oh wait Rui is now completely different than how she started and Hina is still EXACTLY THE SAME.... whoops... guess I gotta do something to reach the endgame, somehow". Considering how hacknyed and forced the last 10 to 20 chapters were, I'm guessing B.