For me I think it will be a happy ending. Why? Because he turned himself in and that will probably give him a chance to explain that the guy he killed was an abusive husband and then Chihiro came calling his name. Chihiro can side with Mitsui telling him that it's the truth and if Mitsui is not there she would've died. Chihiro can also tell that it was a self defense. She can also show her bruises, scars, and wounds to the officer so that it will be more proof. And then I hope He will be released and then they will have their new chapter of life where they are both happy.