Am I the only one who thinks Hayate will most definitely NOT get into debt again? He might be unlucky (hilariously enough what got him both in and OUT of the debt in the end), but now he's also wary. Extremely wary. And we know he has some incredible skills in pretty much anything. So unless going into debt becomes the only way to save Nagi's life or something - he's free. Besides, Hata is pretty good at going against expectations and typical tropes.
You know, a random thought... Maria abandoning Nagi would probably cause an explosion of more than enough despair in the poor girl to open the path to the Garden... Not that there's any reason for that to happen and it won't, but again, random thought. Would be cool to see Maria-Nagi relationship explored more. Or just Maria in general, really.