I really wish Yasu and Miu be together. She is the only girl in the manga who really deserves him and really needs him. I sympathize a lot with her.
Nobu seeks strength, but as to me, he fails again and again. He was a too easy loot for Yuri, but may be she just wants to be loved and thinks Nobu can do it for her.
Nana's attitude towards Hachi is extremely possessive. I can't judge her, since she was abandoned by her own mother. But she should just understand her possessive wishes and try to manage them somehow. Because she herself is the first person to suffer from them.