I don't like how the manga tried to romanticize the relationship between Wakaba and Odagiri. In the end, they were both selfish individuals who murdered people who didn't deserve it (except the ones who were directly responsible for the murders of 27 years earlier, I guess). And Odagiri eventually killed her, so how am I supposed to believe he truly loved her? I understand that he grew up in peculiar circumstances, but murder is not love. He could have spared her but he didn't.
By the way, I was hoping to see the fiancé's face at the end! Guess it will remain a mystery lol