For me the perfect ending to this manga would be:
Azu finds a new love (I don't care as long as it isn't Junpei) But Junpei can still see his daughter during the weekends and all like many divorced parents do.
Rina stays single and gets her karma! Like seriously she even paid people to ruin Azu's life! She does not deserve a happy ending, and I hope her husband gets over his anger issues and meets someone better, I am sorry, but even though he is a short fuse it is still kinda Rina's fault who ruined everything their relationship had. He might be possessive, but at least he loved her while Rina did not.
Edit: I hate how the manga ended Rina got off completely scot free that snake -_-
Holiday Love