I had such a hard time with Hayato's good endings (
I kept picking the wrong answer in one of the beginning choices which threw off most of my playthroughs), but oh my god that was a good route. The first ending I got was the Reincarnation ending, and then I got the other bad ending, then like a never-ending stream of Hayato's normal ending before finally hitting the good endings. And man oh man, those good endings were good. I don't wanna spoil anything for anybody who might be reading this comment, but I especially liked the more evidently bittersweet quality of the good ending where she had to return to the human world. I thought it really highlighted the character development of both MC and Hayato (but especially Hayato). I dunno. It could also be because I am partial to the thought of fantastical/supernatural creatures living among humans in the human world.
On the whole, though, Good Job!! Hayato's route was great, and I can't wait for the other routes to come out :D